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Fix __wait_on_atomic_t() to call the action func if the counter != 0 

Fix __wait_on_atomic_t() so that it calls the action func if the counter != 0
rather than if the counter is 0 so as to be analogous to __wait_on_bit().

Thanks to Yacine who found this by visual inspection.

This will affect FS-Cache in that it will could fail to sleep correctly when
trying to clean up after a netfs cookie is withdrawn.

Reported-by: Yacine Belkadi <yacine.belkadi.1@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
cc: Milosz Tanski <milosz@adfin.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2013-07-23 16:49:24 +01:00 committed by Linus Torvalds
parent 7c6d4dca77
commit 42577ca8c3
1 changed files with 2 additions and 1 deletions
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3
kernel/wait.c
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@ -333,7 +333,8 @@ int __wait_on_atomic_t(wait_queue_head_t *wq, struct wait_bit_queue *q,
prepare_to_wait(wq, &q->wait, mode);
val = q->key.flags;
if (atomic_read(val) == 0)
ret = (*action)(val);
break;
ret = (*action)(val);
} while (!ret && atomic_read(val) != 0);
finish_wait(wq, &q->wait);
return ret;