tree 1494f94f71a299d32a3584565a538e5ffdef1163
parent 5ede972df1cd9294c82e9515949fd2103be81d7b
author Michel Lespinasse <walken@google.com> 1367934356 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1367936416 -0700

rwsem: avoid taking wait_lock in rwsem_down_write_failed

In rwsem_down_write_failed(), if there are active locks after we wake up
(i.e.  the lock got stolen from us), skip taking the wait_lock and go
back to sleep immediately.

Signed-off-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>