ipc/sem.c: update sem_otime for all operations
authorManfred Spraul <manfred@colorfullife.com>
Mon, 30 Sep 2013 20:45:25 +0000 (13:45 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 18 Oct 2013 14:45:48 +0000 (07:45 -0700)
commite556ea0191d648c63fbc4fe24bbfb15ad872a205
treea5a45211eff01fde39bca0c148327cca54405e42
parent83aeb6e3449cc54fa8867a0c9cc1b8d2484fa91e
ipc/sem.c: update sem_otime for all operations

commit 0e8c665699e953fa58dc1b0b0d09e5dce7343cc7 upstream.

In commit 0a2b9d4c7967 ("ipc/sem.c: move wake_up_process out of the
spinlock section"), the update of semaphore's sem_otime(last semop time)
was moved to one central position (do_smart_update).

But since do_smart_update() is only called for operations that modify
the array, this means that wait-for-zero semops do not update sem_otime
anymore.

The fix is simple:
Non-alter operations must update sem_otime.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Reported-by: Jia He <jiakernel@gmail.com>
Tested-by: Jia He <jiakernel@gmail.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
ipc/sem.c