From: Roland Stigge <stigge@antcom.de>
Date: Thu, 10 Feb 2011 23:01:23 +0000 (-0800)
Subject: drivers/gpio/pca953x.c: add a mutex to fix race condition
X-Git-Tag: v2.6.38-rc5~41
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e20fb18054c179d7e64c0af43d855b9310a3394;p=pandora-kernel.git

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>
---

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