tree 7fe6eda33162dbeab61afc2392229b9c57a644f1
parent 01e05e9a90b8f4c3997ae0537e87720eb475e532
author Roland Stigge <stigge@antcom.de> 1297378883 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1297469540 -0800

drivers/gpio/pca953x.c: add a mutex to fix race condition

Add a mutex to register communication and handling.  Without the mutex,
GPIOs didn't switch as expected when toggled in a fast sequence of
status changes of multiple outputs.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Marc Zyngier <maz@misterjones.org>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>