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author | Johannes Weiner <hannes@cmpxchg.org> | 2009-03-10 22:44:01 +0100 |
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committer | Jiri Kosina <jkosina@suse.cz> | 2009-03-10 22:44:01 +0100 |
commit | 96fe2ab830d7dffee1b3d8abf27ced4d7d5765e7 (patch) | |
tree | f59b1549ecf9fe5e2c5adafc77d16aa36942e07d /drivers/hid/usbhid/usbhid.h | |
parent | 48e7a3c95c9f98c2cb6f894820e3cc2d0448e92f (diff) |
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>
Diffstat (limited to 'drivers/hid/usbhid/usbhid.h')
0 files changed, 0 insertions, 0 deletions