linux/include
Dmitry Torokhov 4097461897 Input: i8042 - break load dependency between atkbd/psmouse and i8042
As explained in 1407814240-4275-1-git-send-email-decui@microsoft.com we
have a hard load dependency between i8042 and atkbd which prevents
keyboard from working on Gen2 Hyper-V VMs.

> hyperv_keyboard invokes serio_interrupt(), which needs a valid serio
> driver like atkbd.c.  atkbd.c depends on libps2.c because it invokes
> ps2_command().  libps2.c depends on i8042.c because it invokes
> i8042_check_port_owner().  As a result, hyperv_keyboard actually
> depends on i8042.c.
>
> For a Generation 2 Hyper-V VM (meaning no i8042 device emulated), if a
> Linux VM (like Arch Linux) happens to configure CONFIG_SERIO_I8042=m
> rather than =y, atkbd.ko can't load because i8042.ko can't load(due to
> no i8042 device emulated) and finally hyperv_keyboard can't work and
> the user can't input: https://bugs.archlinux.org/task/39820
> (Ubuntu/RHEL/SUSE aren't affected since they use CONFIG_SERIO_I8042=y)

To break the dependency we move away from using i8042_check_port_owner()
and instead allow serio port owner specify a mutex that clients should use
to serialize PS/2 command stream.

Reported-by: Mark Laws <mdl@60hz.org>
Tested-by: Mark Laws <mdl@60hz.org>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2016-07-27 14:20:09 -07:00
..
acpi device property: Avoid potential dereferences of invalid pointers 2016-04-27 23:40:02 +02:00
asm-generic asm-generic/futex: Re-enable preemption in futex_atomic_cmpxchg_inatomic() 2016-04-21 11:06:09 +02:00
clocksource
crypto Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2016-03-17 11:33:45 -07:00
drm drm: Loongson-3 doesn't fully support wc memory 2016-04-22 10:24:11 +10:00
dt-bindings The clk changes for this release cycle are mostly dominated by 2016-03-23 06:06:45 -07:00
keys
kvm arm64: KVM: vgic-v3: Avoid accessing ICH registers 2016-03-09 04:24:04 +00:00
linux Input: i8042 - break load dependency between atkbd/psmouse and i8042 2016-07-27 14:20:09 -07:00
math-emu
media [media] media: vb2: Fix regression on poll() for RW mode 2016-04-25 10:21:23 -03:00
memory
misc cxl: Remove cxl_get_phys_dev() kernel API 2016-03-09 23:40:02 +11:00
net udp_tunnel: Remove redundant udp_tunnel_gro_complete(). 2016-05-06 18:25:26 -04:00
pcmcia
ras
rdma IB/security: Restrict use of the write() interface 2016-04-28 12:03:16 -04:00
rxrpc rxrpc: Be more selective about the types of received packets we accept 2016-03-04 15:56:06 +00:00
scsi Merge branch 'fixes-base' into fixes 2016-04-05 06:56:47 -04:00
soc IOMMU Updates for Linux v4.6 2016-03-22 11:57:43 -07:00
sound ALSA: hda - Update BCLK also at hotplug for i915 HSW/BDW 2016-04-26 10:11:11 +02:00
target target: add a new add_wwn_groups fabrics method 2016-03-30 20:06:44 -07:00
trace Merge branch 'for-linus-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2016-04-09 10:41:34 -07:00
uapi Input: add SW_PEN_INSERTED define 2016-06-29 09:51:03 -07:00
video gpu: ipu-v3: ipu-dmfc: Rename ipu_dmfc_init_channel to ipu_dmfc_config_wait4eot 2016-03-31 11:24:33 +02:00
xen xen: Fix page <-> pfn conversion on 32 bit systems 2016-04-06 11:18:17 +01:00
Kbuild