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.l...@hpe.com>
Reviewed-by: Peter Hurley <pe...@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
