Messages in this thread Patch in this message | | | From | Waiman Long <> | Subject | [PATCH v4 3/5] locking/rwsem: Don't wake up one's own task | Date | Tue, 17 May 2016 21:26:21 -0400 |
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As rwsem_down_read_failed() will queue itself and potentially call __rwsem_do_wake(sem, RWSEM_WAKE_ANY), it is possible that a reader will try to wake up its own task. This patch adds a check to make sure that this won't happen.
Signed-off-by: Waiman Long <Waiman.Long@hpe.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> --- kernel/locking/rwsem-xadd.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/locking/rwsem-xadd.c b/kernel/locking/rwsem-xadd.c index c278f5a..007814f 100644 --- a/kernel/locking/rwsem-xadd.c +++ b/kernel/locking/rwsem-xadd.c @@ -202,7 +202,8 @@ __rwsem_do_wake(struct rw_semaphore *sem, enum rwsem_wake_type wake_type) */ smp_mb(); waiter->task = NULL; - wake_up_process(tsk); + if (tsk != current) + wake_up_process(tsk); put_task_struct(tsk); } while (--loop); -- 1.7.1
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