linux/drivers/hid/usbhid
Johannes Weiner 96fe2ab830 HID: fix waitqueue usage in hiddev
DECLARE_WAITQUEUE doesn't initialize the wait descriptor's task_list
to 'empty' but to zero.

prepare_to_wait() will not enqueue the descriptor to the waitqueue and
finish_wait() will do list_del_init() on a list head that contains
NULL pointers, which oopses.

This was introduced by 079034073 "HID: hiddev cleanup -- handle all
error conditions properly".

The prior code used an unconditional add_to_waitqueue() which didn't
care about the wait descriptor's list head and enqueued the thing
unconditionally.

The new code uses prepare_to_wait() which DOES check the prior list
state, so use DEFINE_WAIT instead.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Oliver Neukum <oliver@neukum.name>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-03-10 22:44:01 +01:00
..
Kconfig HID: make boot protocol drivers depend on EMBEDDED 2009-01-04 01:00:53 +01:00
Makefile HID: remove hid-ff 2008-10-14 23:51:01 +02:00
hid-core.c USB: change interface to usb_lock_device_for_reset() 2009-01-07 09:59:52 -08:00
hid-pidff.c HID: fix a lockup regression when using force feedback on a PID device 2008-10-14 23:51:02 +02:00
hid-quirks.c HID: add proper support for pensketch 12x9 tablet 2009-01-04 01:01:43 +01:00
hiddev.c HID: fix waitqueue usage in hiddev 2009-03-10 22:44:01 +01:00
usbhid.h HID: move usbhid flags to usbhid.h 2009-01-04 01:00:51 +01:00
usbkbd.c HID: remove warn() macro from usb hid drivers 2008-10-14 23:51:03 +02:00
usbmouse.c HID: remove info() macro from usb HID drivers 2008-10-14 23:51:03 +02:00