Commit Graph

691 Commits

Author SHA1 Message Date
Alan Stern
01105a2463 USB: usbfs: fix -ENOENT error code to be -ENODEV
This patch (as1272) changes the error code returned when an open call
for a USB device node fails to locate the corresponding device.  The
appropriate error code is -ENODEV, not -ENOENT.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Kay Sievers <kay.sievers@vrfy.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-08-07 16:05:13 -07:00
Michael Buesch
18753ebc8a USB: devio: Properly do access_ok() checks
access_ok() checks must be done on every part of the userspace structure
that is accessed. If access_ok() on one part of the struct succeeded, it
does not imply it will succeed on other parts of the struct. (Does
depend on the architecture implementation of access_ok()).

This changes the __get_user() users to first check access_ok() on the
data structure.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: stable <stable@kernel.org>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-08-07 16:05:12 -07:00
Sarah Sharp
9f8e443816 USB: Fix parsing of SuperSpeed Endpoint Companion descriptor.
usb_parse_ss_endpoint_companion() was supposed to allocate a structure to
hold the SuperSpeed Endpoint Companion descriptor, and either copy the
values the device returned, or fill in default values if the device
descriptor did not include the companion descriptor.

However, the previous code would miss the last endpoint in a configuration
with no descriptors after it.  Make usb_parse_endpoint() allocate the SS
endpoint companion descriptor and fill it with default values, even if
we've run out of buffer space in this configuration descriptor.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-07-28 14:31:13 -07:00
Alan Stern
9180135bc8 USB: handle zero-length usbfs submissions correctly
This patch (as1262) fixes a bug in usbfs: It refuses to accept
zero-length transfers, and it insists that the buffer pointer be valid
even if there is no data being transferred.

The patch also consolidates a bunch of repetitive access_ok() checks
into a single check, which incidentally fixes the lack of such a check
for Isochronous URBs.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-07-12 15:16:41 -07:00
Daniel Mack
0cce2eda19 USB: fix LANGID=0 regression
commit b7af0bb ("USB: allow malformed LANGID descriptors") broke support
for devices without string descriptor support.

Reporting string descriptors is optional to USB devices, and a device
lets us know it can't deal with strings by responding to the LANGID
request with a STALL token.

The kernel handled that correctly before b7af0bb came in, but failed
hard if the LANGID was reported but broken. More than that, if a device
was not able to provide string descriptors, the LANGID was retrieved
over and over again at each string read request.

This patch changes the behaviour so that

 a) the LANGID is only queried once
 b) devices which can't handle string requests are not asked again
 c) devices with malformed LANGID values have a sane fallback to 0x0409

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-07-12 15:16:40 -07:00
Oliver Neukum
516a1a07f0 USB: fix race leading to a write after kfree in usbfs
this fixes a race between async_completed() and proc_reapurbnonblock().

CPU A                   CPU B

spin_lock(&ps->lock);
list_move_tail(&as->asynclist, &ps->async_completed);
spin_unlock(&ps->lock);

                                if (!(as = async_getcompleted(ps)))
                                        return -EAGAIN;
                                return processcompl(as, (void __user * __user *)arg);

processcompl() calls free_async() which calls kfree(as)

as->status = urb->status;
if (as->signr) {
        sinfo.si_signo = as->signr;
        sinfo.si_errno = as->status;
        sinfo.si_code = SI_ASYNCIO;
        sinfo.si_addr = as->userurb;
        kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
                              as->euid, as->secid);
}
snoop(&urb->dev->dev, "urb complete\n");
snoop_urb(urb, as->userurb);

write after kfree

Signed-off-by: Oliver Neukum <oliver@neukum.org>
2009-07-12 15:16:40 -07:00
Greg Kroah-Hartman
e12df02a17 Revert USB: usbfs: deprecate and hide option for !embedded
This reverts commit cc71329b3b, so that
Red Hat machines can boot properly.  It seems that the Red Hat initrd
code tries to watch the /proc/bus/usb/devices file to monitor usb
devices showing up.  While this task is prone to lots of races and does
not show the true state of the system, they seem to like it.

So for now, don't move this option under the EMBEDDED config option.


Cc: Scott James Remnant <scott@canonical.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Jeff Chua <jeff.chua.linux@gmail.com>
Cc: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-07-12 15:16:39 -07:00
Frans Pop
bf7fbb022f USB: add missing class descriptions used in usb/devices file
Added descriptions (for WIRELESS_CONTROLLER and MISC) were taken from
the usb-devices script now included in usbutils.

Also sort the classes in the same order as in include/linux/usb/ch9.h
for easier comparison for future updates.

Signed-off-by: Frans Pop <elendil@planet.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-07-12 15:16:39 -07:00
Oliver Neukum
d794a02111 USB: fix memleak in usbfs
This patch fixes a memory leak in devio.c::processcompl

If writing to user space fails the packet must be discarded, as it
already has been removed from the queue of completed packets.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-07-12 15:16:39 -07:00
Alan Stern
cb88a1b887 USB: fix the clear_tt_buffer interface
This patch (as1255) updates the interface for calling
usb_hub_clear_tt_buffer().  Even the name of the function is changed!

When an async URB (i.e., Control or Bulk) going through a high-speed
hub to a non-high-speed device is cancelled or fails, the hub's
Transaction Translator buffer may be left busy still trying to
complete the transaction.  The buffer has to be cleared; that's what
usb_hub_clear_tt_buffer() does.

It isn't safe to send any more URBs to the same endpoint until the TT
buffer is fully clear.  Therefore the HCD needs to be told when the
Clear-TT-Buffer request has finished.  This patch adds a callback
method to struct hc_driver for that purpose, and makes the hub driver
invoke the callback at the proper time.

The patch also changes a couple of names; "hub_tt_kevent" and
"tt.kevent" now look rather antiquated.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-07-12 15:16:38 -07:00
Joe Perches
ad361c9884 Remove multiple KERN_ prefixes from printk formats
Commit 5fd29d6ccb ("printk: clean up
handling of log-levels and newlines") changed printk semantics.  printk
lines with multiple KERN_<level> prefixes are no longer emitted as
before the patch.

<level> is now included in the output on each additional use.

Remove all uses of multiple KERN_<level>s in formats.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-07-08 10:30:03 -07:00
Linus Torvalds
e1f5b94fd0 Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (143 commits)
  USB: xhci depends on PCI.
  USB: xhci: Add Makefile, MAINTAINERS, and Kconfig entries.
  USB: xhci: Respect critical sections.
  USB: xHCI: Fix interrupt moderation.
  USB: xhci: Remove packed attribute from structures.
  usb; xhci: Fix TRB offset calculations.
  USB: xhci: replace if-elseif-else with switch-case
  USB: xhci: Make xhci-mem.c include linux/dmapool.h
  USB: xhci: drop spinlock in xhci_urb_enqueue() error path.
  USB: Change names of SuperSpeed ep companion descriptor structs.
  USB: xhci: Avoid compiler reordering in Link TRB giveback.
  USB: xhci: Clean up xhci_irq() function.
  USB: xhci: Avoid global namespace pollution.
  USB: xhci: Fix Link TRB handoff bit twiddling.
  USB: xhci: Fix register write order.
  USB: xhci: fix some compiler warnings in xhci.h
  USB: xhci: fix lots of compiler warnings.
  USB: xhci: use xhci_handle_event instead of handle_event
  USB: xhci: URB cancellation support.
  USB: xhci: Scatter gather list support for bulk transfers.
  ...
2009-06-16 13:06:10 -07:00
Viral Mehta
7dd19e69d1 USB: xhci: replace if-elseif-else with switch-case
Replace if-elseif-else with switch-case
to keep the code consistent which is semantically same

Switch-case is used here,
http://www.spinics.net/lists/linux-usb/msg17201.html
Making consistent at other places in usb/core

Also easier to read and maintain when USB4.0, 5.0, ... comes

Signed-off-by: Viral Mehta <viral.mehta@einfochips.com>
Tested-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:50 -07:00
Sarah Sharp
f0058c6278 USB: Change names of SuperSpeed ep companion descriptor structs.
Differentiate between SuperSpeed endpoint companion descriptor and the
wireless USB endpoint companion descriptor.  Make all structure names for
this descriptor have "ss" (SuperSpeed) in them.  David Vrabel asked for
this change in http://marc.info/?l=linux-usb&m=124091465109367&w=2

Reported-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:50 -07:00
Sarah Sharp
e04748e3a8 USB: Push scatter gather lists down to host controller drivers.
This is the original patch I created before David Vrabel posted a better
patch (http://marc.info/?l=linux-usb&m=123377477209109&w=2) that does
basically the same thing.  This patch will get replaced with his
(modified) patch later.

Allow USB device drivers that use usb_sg_init() and usb_sg_wait() to push
bulk endpoint scatter gather lists down to the host controller drivers.
This allows host controller drivers to more efficiently enqueue these
transfers, and allows the xHCI host controller to better take advantage of
USB 3.0 "bursts" for bulk endpoints.

This patch currently only enables scatter gather lists for bulk endpoints.
Other endpoint types that use the usb_sg_* functions will not have their
scatter gather lists pushed down to the host controller.  For periodic
endpoints, we want each scatterlist entry to be a separate transfer.
Eventually, HCDs could parse these scatter-gather lists for periodic
endpoints also.  For now, we use the old code and call usb_submit_urb()
for each scatterlist entry.

The caller of usb_sg_init() can request that all bytes in the scatter
gather list be transferred by passing in a length of zero.  Handle that
request for a bulk endpoint under xHCI by walking the scatter gather list
and calculating the length.  We could let the HCD handle a zero length in
this case, but I'm not sure if the core layers in between will get
confused by this.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:49 -07:00
Sarah Sharp
79abb1ab13 USB: Support for bandwidth allocation.
Originally, the USB core had no support for allocating bandwidth when a
particular configuration or alternate setting for an interface was
selected.  Instead, the device driver's URB submission would fail if
there was not enough bandwidth for a periodic endpoint.  Drivers could
work around this, by using the scatter-gather list API to guarantee
bandwidth.

This patch adds host controller API to allow the USB core to allocate or
deallocate bandwidth for an endpoint.  Endpoints are added to or dropped
from a copy of the current schedule by calling add_endpoint() or
drop_endpoint(), and then the schedule is atomically evaluated with a
call to check_bandwidth().  This allows all the endpoints for a new
configuration or alternate setting to be added at the same time that the
endpoints from the old configuration or alt setting are dropped.

Endpoints must be added to the schedule before any URBs are submitted to
them.  The HCD must be allowed to reject a new configuration or alt
setting before the control transfer is sent to the device requesting the
change.  It may reject the change because there is not enough bandwidth,
not enough internal resources (such as memory on an embedded host
controller), or perhaps even for security reasons in a virtualized
environment.

If the call to check_bandwidth() fails, the USB core must call
reset_bandwidth().  This causes the schedule to be reverted back to the
state it was in just after the last successful check_bandwidth() call.

If the call succeeds, the host controller driver (and hardware) will have
changed its internal state to match the new configuration or alternate
setting.  The USB core can then issue a control transfer to the device to
change the configuration or alt setting.  This allows the core to test new
configurations or alternate settings before unbinding drivers bound to
interfaces in the old configuration.

WIP:

The USB core must add endpoints from all interfaces in a configuration
to the schedule, because a driver may claim that interface at any time.
A slight optimization might be to add the endpoints to the schedule once
a driver claims that interface.  FIXME

This patch does not cover changing alternate settings, but it does
handle a configuration change or de-configuration.  FIXME

The code for managing the schedule is currently HCD specific.  A generic
scheduling algorithm could be added for host controllers without
built-in scheduling support.  For now, if a host controller does not
define the check_bandwidth() function, the call to
usb_hcd_check_bandwidth() will always succeed.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:49 -07:00
Sarah Sharp
663c30d082 USB: Parse and store the SuperSpeed endpoint companion descriptors.
The USB 3.0 bus specification added an "Endpoint Companion" descriptor that is
supposed to follow all SuperSpeed Endpoint descriptors.  This descriptor is used
to extend the bus protocol to allow more packets to be sent to an endpoint per
"microframe".  The word microframe was removed from the USB 3.0 specification
because the host controller does not send Start Of Frame (SOF) symbols down the
USB 3.0 wires.

The descriptor defines a bMaxBurst field, which indicates the number of packets
of wMaxPacketSize that a SuperSpeed device can send or recieve in a service
interval.  All non-control endpoints may set this value as high as 16 packets
(bMaxBurst = 15).

The descriptor also allows isochronous endpoints to further specify that they
can send and receive multiple bursts per service interval.  The bmAttributes
allows them to specify a "Mult" of up to 3 (bmAttributes = 2).

Bulk endpoints use bmAttributes to report the number of "Streams" they support.
This was an extension of the endpoint pipe concept to allow multiple mass
storage device commands to be outstanding for one bulk endpoint at a time.  This
should allow USB 3.0 mass storage devices to support SCSI command queueing.
Bulk endpoints can say they support up to 2^16 (65,536) streams.

The information in the endpoint companion descriptor must be stored with the
other device, config, interface, and endpoint descriptors because the host
controller needs to access them quickly, and we need to install some default
values if a SuperSpeed device doesn't provide an endpoint companion descriptor.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:49 -07:00
Sarah Sharp
c6515272b8 USB: Support for addressing a USB device under xHCI
Add host controller driver API and a slot_id variable to struct
usb_device.  This allows the xHCI host controller driver to ask the
hardware to allocate a slot for the device when a struct usb_device is
allocated.  The slot needs to be allocated at that point because the
hardware can run out of internal resources, and we want to know that very
early in the device connection process.  Don't call this new API for root
hubs, since they aren't real devices.

Add HCD API to let the host controller choose the device address.  This is
especially important for xHCI hardware running in a virtualized
environment.  The guests running under the VM don't need to know which
addresses on the bus are taken, because the hardware picks the address for
them.  Announce SuperSpeed USB devices after the address has been assigned
by the hardware.

Don't use the new get descriptor/set address scheme with xHCI.  Unless
special handling is done in the host controller driver, the xHC can't
issue control transfers before you set the device address.  Support for
the older addressing scheme will be added when the xHCI driver supports
the Block Set Address Request (BSR) flag in the Address Device command.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:49 -07:00
Sarah Sharp
7206b00164 USB: Add route string to struct usb_device.
This patch adds a hex route string to each USB device.  The route string is used
by the USB 3.0 host controller to send packets through the device tree.  USB 3.0
hubs use this string to route packets to the correct port.  This is fundamental
bus change from USB 2.0, where all packets were broadcast across the bus.

Devices (including hubs) under a root port receive the route string 0x0.  Every
four bits in the route string represent a port on a hub.  This length works
because USB 3.0 hubs are limited to 15 ports, and USB 2.0 hubs (with potentially
more ports) will never see packets with a route string.  A port number of 0
means the packet is destined for that hub.

For example, a peripheral device might have a route string of 0x00097.
This means the device is connected to port 9 of the hub at depth 1.
The hub at depth 1 is connected to port 7 of a hub at depth 0.
The hub at depth 0 is connected to a root port.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:48 -07:00
Sarah Sharp
e7b7717247 USB: Don't reset USB 3.0 devices on port change detection.
The USB 3.0 bus specification defines a new connection sequence for USB 3.0
hubs and roothubs.  USB 3.0 devices are reset and link trained by the hub
before the port status change notification is sent to the host OS.  This means
that an entire tree of devices can be trained in parallel on power up, and the
OS no longer needs to reset USB 3.0 devices.  Change the USB core's hub port
init sequence so that it does not reset USB 3.0 devices.

The port status change from the roothub and from the USB 3.0 hub will report
the SuperSpeed connect correctly.  This patch currently only handles the
roothub case.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:48 -07:00
Sarah Sharp
d2e9b4d673 USB: Add USB 3.0 roothub support to USB core.
Add USB 3.0 root hub descriptors.  This is a kludge because I reused the old
USB 2.0 descriptors, instead of using the new USB 3.0 hub descriptors with
endpoint companion descriptors and other descriptors.  I did this because I
wasn't ready to add USB 3.0 hub changes to khubd.  For now, a USB 3.0 roothub
looks like a USB 2.0 roothub, with a higher speed.

USB 3.0 hubs have no transaction translator (TT).

Make USB core debugging handle super speed ports.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:48 -07:00
Sarah Sharp
6b403b020c USB: Add SuperSpeed to the list of USB device speeds.
Modify the USB core to handle the new USB 3.0 speed, "SuperSpeed".  This
is 5.0 Gbps (wire speed).  There are probably more places that check for
speed that I've missed.

SuperSpeed devices have a 512 byte endpoint 0 max packet size.  This shows
up as a bMaxPacketSize0 set to 0x09 (see table 9-8 of the USB 3.0 bus
spec).

xHCI spec says that the xHC can handle intervals up to 2^15 microframes.  That
might change when real silicon becomes available.

Add FIXME note for SuperSpeed isochronous endpoints.  They can transmit up
to 16 packets in one "burst" before they wait for an acknowledgment of the
packets.  They can do up to 3 bursts per microframe (determined by the
mult value in the endpoint companion descriptor).  The xHCI driver doesn't
have support for isoc yet, so fix this later.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:48 -07:00
Sarah Sharp
66d4eadd8d USB: xhci: BIOS handoff and HW initialization.
Add PCI initialization code to take control of the xHCI host controller
away from the BIOS, halt, and reset the host controller.  The xHCI spec
says that BIOSes must give up the host controller within 5 seconds.

Add some host controller glue functions to handle hardware initialization
and memory allocation for the host controller.  The current xHCI
prototypes use PCI interrupts, but the xHCI spec requires MSI-X
interrupts.  Add code to support MSI-X interrupts, but use the PCI
interrupts for now.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:48 -07:00
Frans Pop
23a54e5675 USB: Avoid PM error messages during resume if a device was disconnected
Currently if a laptop is suspended e.g. while docked and then resumed after
undocking it, the following errors get generated because the USB hub in the
docking station and the devices connected to it are no longer available:
pm_op(): usb_dev_resume+0x0/0x10 returns -19
PM: Device 1-2 failed to resume: error -19
pm_op(): usb_dev_resume+0x0/0x10 returns -19
PM: Device 1-2.2 failed to resume: error -19
pm_op(): usb_dev_resume+0x0/0x10 returns -19
PM: Device 1-2.3 failed to resume: error -19

As the removal of USB devices while a system is suspended is a relatively
common use case and in most cases not an error, just return success on
-ENODEV. The user gets informed anyway as the USB subsystem generates
regular disconnect messages for the devices shortly afterwards:
usb 1-2: USB disconnect, address 3
usb 1-2.2: USB disconnect, address 4
usblp0: removed
usb 1-2.3: USB disconnect, address 5

Signed-off-by: Frans Pop <elendil@planet.nl>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:47 -07:00
FUJITA Tomonori
9b8e7ba68a USB: replace dma_sync_single and dma_sync_sg with dma_sync_single_for_cpu and dma_sync_sg_for_cpu
This replaces dma_sync_single() and dma_sync_sg() with
dma_sync_single_for_cpu() and dma_sync_sg_for_cpu() respectively
because they is an obsolete API; include/linux/dma-mapping.h says:

/* Backwards compat, remove in 2.7.x */
#define dma_sync_single		dma_sync_single_for_cpu
#define dma_sync_sg		dma_sync_sg_for_cpu

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:46 -07:00
Kay Sievers
5512966643 usb: convert endpoint devices to bus-less childs of the usb interface
The endpoint devices look like simple attribute groups now, and no longer
like devices with a specific subsystem. They will also no longer emit uevents.

It also removes the device node requests for endpoint devices, which are not
implemented for now.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:45 -07:00
Alan Stern
6ec4beb5c7 USB: new flag for resume-from-hibernation
This patch (as1237) changes the way the PCI host controller drivers
avoid retaining bogus hardware states during resume-from-hibernation.
Previously we had reset the hardware as part of preparing to reinstate
the memory image.  But we can do better now with the new PM framework,
since we know exactly which resume operations are from hibernation.

The pci_resume method is changed to accept a flag indicating whether
the system is resuming from hibernation.  When this flag is set, the
drivers will reset the hardware to get rid of any existing state.

Similarly, the pci_suspend method is changed to remove the
pm_message_t argument.  It's no longer needed, since no special action
has to be taken when preparing to reinstate the memory image.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:44 -07:00
Alan Stern
abb306416a USB: move PCI host controllers to new PM framework
This patch (as1236) converts the USB PCI power management routines
over to the new PM framework.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:44 -07:00
Greg Kroah-Hartman
820d7a253c USB: remove unused usb_host class
The usb_host class isn't used for anything anymore (it was used for
debug files, but they have moved to debugfs a few kernel releases ago),
so let's delete it before someone accidentally puts a file in it.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:43 -07:00
Alan Stern
74675a5850 NLS: update handling of Unicode
This patch (as1239) updates the kernel's treatment of Unicode.  The
character-set conversion routines are well behind the current state of
the Unicode specification: They don't recognize the existence of code
points beyond plane 0 or of surrogate pairs in the UTF-16 encoding.

The old wchar_t 16-bit type is retained because it's still used in
lots of places.  This shouldn't cause any new problems; if a
conversion now results in an invalid 16-bit code then before it must
have yielded an undefined code.

Difficult-to-read names like "utf_mbstowcs" are replaced with more
transparent names like "utf8s_to_utf16s" and the ordering of the
parameters is rationalized (buffer lengths come immediate after the
pointers they refer to, and the inputs precede the outputs).
Fortunately the low-level conversion routines are used in only a few
places; the interfaces to the higher-level uni2char and char2uni
methods have been left unchanged.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:43 -07:00
Clemens Ladisch
a853a3d4eb usb: return device strings in UTF-8
Change the encoding of strings returned by usb_string() from ISO 8859-1
to UTF-8.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:43 -07:00
Greg Kroah-Hartman
97d7b7a41b USB: add the usbfs devices file to debugfs
People are very used to the devices file in usbfs.  Now that we have
moved usbfs to be an "embedded" option only, the developers miss the
file, they had grown quite attached to it over all of these years.  This
patch brings it back and puts it in the usb debugfs directory, so that
the developers don't feel sad anymore.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:43 -07:00
Greg Kroah-Hartman
00048b8bde USB: add usb debugfs directory
Add a common usb directory in debugfs that the usb subsystem can use.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:42 -07:00
H Hartley Sweeten
d0f830d30c USB: hub.c: fix sparse warnings
Fix sparse warning in drivers/usb/core/hub.c.

The following sparse warning is seen when building on ARM due
do the macro raw_local_irq_save():

	warning: symbol 'temp' shadows an earlier one

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:42 -07:00
H Hartley Sweeten
a864e3aa5d USB: core/sysfs: fix sparse warnings
Fix 3 sparse warning in drivers/usb/core/sysfs.c.

	warning: symbol '__mptr' shadows an earlier one

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:41 -07:00
Scott James Remnant
cc71329b3b USB: usbfs: deprecate and hide option for !embedded
Modern systems do not use usbfs; the entries within it are files,
not device nodes, and do not support ACLs which are the default way to
provide access to USB devices to untrusted users.

It is replaced by device-nodes maintained by udev in /dev/bus/usb,
libusb uses this device nodes.

Mark the option as deprecated, and hide entirely for non-embedded builds
(which may not be using udev but require raw USB device access).

Signed-off-by: Scott James Remnant <scott@canonical.com>
Acked-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:41 -07:00
Alan Stern
91f8d063d3 USB: consolidate usb_unbind_interface and usb_driver_release_interface
This patch (as1230) consolidates code in usb_unbind_interface() and
usb_driver_release_interface().  In fact, it makes release_interface
call unbind_interface, thereby removing the need for duplicated code.

It works like this: If the interface has already been registered with
the driver core when a driver releases it, then the usual driver-core
mechanism will call unbind_interface.  If it hasn't been unregistered
then we will make the call ourselves.

As a nice bonus, drivers now don't have to worry about whether their
disconnect method will get called when they release an interface -- it
always will.  Previously it would be called only if the interface was
registered.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:44:41 -07:00
Kay Sievers
f7a386c5b8 Driver Core: usb: add nodename support for usb drivers.
This adds support for USB drivers to report their requested nodename to
userspace.  It also updates a number of USB drivers to provide the
needed subdirectory and device name to be used for them.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-06-15 21:30:25 -07:00
Alessio Igor Bogani
337eb00a2c Push BKL down into ->remount_fs()
[xfs, btrfs, capifs, shmem don't need BKL, exempt]

Signed-off-by: Alessio Igor Bogani <abogani@texware.it>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-06-11 21:36:11 -04:00
Johannes Berg
a8aa401f38 USB: pass mem_flags to dma_alloc_coherent
When I want to use my webcam, I get:

                                 vvvvvvv
cheese: page allocation failure. order:5, mode:0x8004
Pid: 8100, comm: cheese Not tainted 2.6.30-rc2-wl-dirty #102
Call Trace:
 [<ffffffff802c5d8e>] __alloc_pages_internal+0x3fe/0x520
 [<ffffffff80210a20>] dma_generic_alloc_coherent+0x90/0x120
 [<ffffffffa001c91e>] hcd_buffer_alloc+0xee/0x130 [usbcore]
 [<ffffffffa000d52d>] usb_buffer_alloc+0x2d/0x40 [usbcore]
 [<ffffffffa0160e14>] uvc_alloc_urb_buffers+0x84/0x140 [uvcvideo]
 [<ffffffffa0160ff6>] uvc_init_video+0x126/0x400 [uvcvideo]
 [...]

Oddly, I remembered fixing this and putting in __GFP_NOWARN
because uvcvideo retries a smaller allocation. However, the
allocation function doesn't pass the gfp flags through to
dma_alloc_coherent so we still get the warning!

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-04-23 14:15:28 -07:00
David Vrabel
3444b26afa USB: add reset endpoint operations
Wireless USB endpoint state has a sequence number and a current
window and not just a single toggle bit.  So allow HCDs to provide a
endpoint_reset method and call this or clear the software toggles as
required (after a clear halt, set configuration etc.).

usb_settoggle() and friends are then HCD internal and are moved into
core/hcd.h and all device drivers call usb_reset_endpoint() instead.

If the device endpoint state has been reset (with a clear halt) but
the host endpoint state has not then subsequent data transfers will
not complete. The device will only work again after it is reset or
disconnected.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-04-17 10:50:27 -07:00
Daniel Mack
b7af0bb268 USB: allow malformed LANGID descriptors
When an USB hardware does not provide a valid LANGID, fall back to value
zero which is still a reasonable default for most devices.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:45 -07:00
Roel Kluin
71d2718f25 USB: more u32 conversion after transfer_buffer_length and actual_length
transfer_buffer_length and actual_length have become unsigned, therefore some
additional conversion of local variables, function arguments and print
specifications is desired.

A test for a negative urb->transfer_buffer_length became obsolete; instead
we ensure that it does not exceed INT_MAX. Also, urb->actual_length is always
less than urb->transfer_buffer_length.

rh_string() does no longer return -EPIPE in the case of an unsupported ID.
Instead its only caller, rh_call_control() does the check.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:45 -07:00
Alan Stern
d34d9721a5 USB: usbfs: remove unneeded "inline" annotations
This patch (as1223) removes a bunch of unnecessary "inline"
annotations from the usbfs driver.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:44 -07:00
Alan Stern
4fe0387afa USB: don't send Set-Interface after reset
This patch (as1221) changes the way usbcore reinitializes a device
following a reset or a reset-resume.  Currently we call
usb_set_interface() for every interface in the active configuration;
this is to put the interface into the same altsetting as before the
reset and to make sure that the host's endpoint state matches the
device's endpoint state.

However, sending a Set-Interface request is a waste of time if an
interface was already in altsetting 0 before the reset, since it is
certainly in altsetting 0 afterward.  In addition, many devices can't
handle Set-Interface requests -- they crash when they receive them.

So instead, the patch adds code to check each interface.  If the
interface wasn't in altsetting 0 before the reset, we go head with the
Set-Interface request as before.  But if it was then we skip sending
the Set-Interface request, and we clear out the host-side endpoint
state by calling usb_disable_interface() followed by
usb_enable_interface().

The patch also adds a couple of new comments to explain what's going
on.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:38 -07:00
David Vrabel
6da9c99059 USB: allow libusb to talk to unauthenticated WUSB devices
To permit a userspace application to associate with WUSB devices
using numeric association, control transfers to unauthenticated WUSB
devices must be allowed.

This requires that wusbcore correctly sets the device state to
UNAUTHENTICATED, DEFAULT and ADDRESS and that control transfers can be
performed to UNAUTHENTICATED devices.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:35 -07:00
Harvey Harrison
551509d267 USB: replace uses of __constant_{endian}
The base versions handle constant folding now.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:33 -07:00
Julia Lawall
2e0fe70968 USB: drivers: use USB API functions rather than constants
This set of patches introduces calls to the following set of functions:

usb_endpoint_dir_in(epd)
usb_endpoint_dir_out(epd)
usb_endpoint_is_bulk_in(epd)
usb_endpoint_is_bulk_out(epd)
usb_endpoint_is_int_in(epd)
usb_endpoint_is_int_out(epd)
usb_endpoint_num(epd)
usb_endpoint_type(epd)
usb_endpoint_xfer_bulk(epd)
usb_endpoint_xfer_control(epd)
usb_endpoint_xfer_int(epd)
usb_endpoint_xfer_isoc(epd)

In some cases, introducing one of these functions is not possible, and it
just replaces an explicit integer value by one of the following constants:

USB_ENDPOINT_XFER_BULK
USB_ENDPOINT_XFER_CONTROL
USB_ENDPOINT_XFER_INT
USB_ENDPOINT_XFER_ISOC

An extract of the semantic patch that makes these changes is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r1@ struct usb_endpoint_descriptor *epd; @@

- ((epd->bmAttributes & \(USB_ENDPOINT_XFERTYPE_MASK\|3\)) ==
- \(USB_ENDPOINT_XFER_CONTROL\|0\))
+ usb_endpoint_xfer_control(epd)

@r5@ struct usb_endpoint_descriptor *epd; @@

- ((epd->bEndpointAddress & \(USB_ENDPOINT_DIR_MASK\|0x80\)) ==
-  \(USB_DIR_IN\|0x80\))
+ usb_endpoint_dir_in(epd)

@inc@
@@

#include <linux/usb.h>

@depends on !inc && (r1||r5)@
@@

+ #include <linux/usb.h>
  #include <linux/usb/...>
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:28 -07:00
Alan Stern
1662e3a7f0 USB: add quirk to avoid config and interface strings
Apparently the Configuration and Interface strings aren't used as
often as the Vendor, Product, and Serial strings.  In at least one
device (a Saitek Cyborg Gold 3D joystick), attempts to read the
Configuration string cause the device to stop responding to Control
requests.

This patch (as1226) adds a quirks flag, telling the kernel not to
read a device's Configuration or Interface strings, together with a
new quirk for the offending joystick.

Reported-by: Melchior FRANZ <melchior.franz@gmail.com>
Tested-by: Melchior FRANZ <melchior.franz@gmail.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>  [2.6.28 and 2.6.29, nothing earlier]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:25 -07:00
Alan Stern
6ff1046409 USB: usbfs: keep async URBs until the device file is closed
The usbfs driver manages a list of completed asynchronous URBs.  But
it is too eager to free the entries on this list: destroy_async() gets
called whenever an interface is unbound or a device is removed, and it
deallocates the outstanding struct async entries for all URBs on that
interface or device.  This is wrong; the user program should be able
to reap an URB any time after it has completed, regardless of whether
or not the interface is still bound or the device is still present.

This patch (as1222) moves the code for deallocating the completed list
entries from destroy_async() to usbdev_release().  The outstanding
entries won't be freed until the user program has closed the device
file, thereby eliminating any possibility that the remaining URBs
might still be reaped.

This fixes a bug in which a program can hang in the USBDEVFS_REAPURB
ioctl when the device is unplugged.

Reported-and-tested-by: Martin Poupe <martin.poupe@upek.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-17 14:01:28 -07:00