path: root/kernel/irq
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authorManfred Spraul <manfred@colorfullife.com>2013-05-26 11:08:52 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-26 15:14:51 -0700
commitab465df9dda42a997f7537c875127eeb6a88158c (patch)
tree28a1ec28c15f1b59c938b7757c8f56eed0de0ecd /kernel/irq
parent89ff77837a67994e4a4a20bb648687fbcc3083f2 (diff)
ipc/sem.c: Fix missing wakeups in do_smart_update_queue()
do_smart_update_queue() is called when an operation (semop, semctl(SETVAL), semctl(SETALL), ...) modified the array. It must check which of the sleeping tasks can proceed. do_smart_update_queue() missed a few wakeups: - if a sleeping complex op was completed, then all per-semaphore queues must be scanned - not only those that were modified by *sops - if a sleeping simple op proceeded, then the global queue must be scanned again And: - the test for "|sops == NULL) before scanning the global queue is not required: If the global queue is empty, then it doesn't need to be scanned - regardless of the reason for calling do_smart_update_queue() The patch is not optimized, i.e. even completing a wait-for-zero operation causes a rescan. This is done to keep the patch as simple as possible. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Rik van Riel <riel@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/irq')
0 files changed, 0 insertions, 0 deletions