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USB: address-0 handling during device initialization

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This patch (as947) changes the device initialization and enumeration
code in hub.c; now udev->devnum will be set to 0 while the device is
being accessed at address 0.  Until now this wasn't needed because the
address value was passed as part of urb->pipe; without that field the
device address must be stored elsewhere.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-07-30 17:08:43 -04:00 committed by Greg Kroah-Hartman
parent 5e60a16139
commit 4326ed0be9
2 changed files with 14 additions and 11 deletions
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21
drivers/usb/core/hub.c
View File

@ -1481,6 +1481,7 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
case 0:
/* TRSTRCY = 10 ms; plus some extra */
msleep(10 + 40);
udev->devnum = 0; /* Device now at address 0 */
/* FALL THROUGH */
case -ENOTCONN:
case -ENODEV:
@ -2005,20 +2006,21 @@ static void ep0_reinit(struct usb_device *udev)
#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
static int hub_set_address(struct usb_device *udev)
static int hub_set_address(struct usb_device *udev, int devnum)
{
int retval;
if (udev->devnum == 0)
if (devnum <= 1)
return -EINVAL;
if (udev->state == USB_STATE_ADDRESS)
return 0;
if (udev->state != USB_STATE_DEFAULT)
return -EINVAL;
retval = usb_control_msg(udev, usb_sndaddr0pipe(),
USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
USB_REQ_SET_ADDRESS, 0, devnum, 0,
NULL, 0, USB_CTRL_SET_TIMEOUT);
if (retval == 0) {
udev->devnum = devnum; /* Device now using proper address */
usb_set_device_state(udev, USB_STATE_ADDRESS);
ep0_reinit(udev);
}
@ -2045,6 +2047,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
unsigned delay = HUB_SHORT_RESET_TIME;
enum usb_device_speed oldspeed = udev->speed;
char *speed, *type;
int devnum = udev->devnum;
/* root hub ports have a slightly longer reset period
* (from USB 2.0 spec, section 7.1.7.5)
@ -2074,7 +2077,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
goto fail;
}
oldspeed = udev->speed;
/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
* it's fixed size except for full speed devices.
* For Wireless USB devices, ep0 max packet is always 512 (tho
@ -2115,7 +2118,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
dev_info (&udev->dev,
"%s %s speed %sUSB device using %s and address %d\n",
(udev->config) ? "reset" : "new", speed, type,
udev->bus->controller->driver->name, udev->devnum);
udev->bus->controller->driver->name, devnum);
/* Set up TT records, if needed */
if (hdev->tt) {
@ -2202,7 +2205,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
}
for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
retval = hub_set_address(udev);
retval = hub_set_address(udev, devnum);
if (retval >= 0)
break;
msleep(200);
@ -2210,7 +2213,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
if (retval < 0) {
dev_err(&udev->dev,
"device not accepting address %d, error %d\n",
udev->devnum, retval);
devnum, retval);
goto fail;
}
@ -2263,8 +2266,10 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
retval = 0;
fail:
if (retval)
if (retval) {
hub_port_disable(hub, port1, 0);
udev->devnum = devnum; /* for disconnect processing */
}
mutex_unlock(&usb_address0_mutex);
return retval;
}

4
drivers/usb/core/urb.c
View File

@ -284,9 +284,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
if (!urb || urb->hcpriv || !urb->complete)
return -EINVAL;
if (!(dev = urb->dev) ||
(dev->state < USB_STATE_DEFAULT) ||
(!dev->bus) || (dev->devnum <= 0))
if (!(dev = urb->dev) || dev->state < USB_STATE_DEFAULT)
return -ENODEV;
if (dev->bus->controller->power.power_state.event != PM_EVENT_ON
|| dev->state == USB_STATE_SUSPENDED)