From: Ashay Jaiswal <ashayj@codeaurora.org>
Date: Thu, 8 Jan 2015 13:24:25 +0000 (+0530)
Subject: regulator: core: fix race condition in regulator_put()
X-Git-Tag: v3.2.67~62
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a8a47c5a3d71507abed60d05af1826f334d1e3e;p=pandora-kernel.git

regulator: core: fix race condition in regulator_put()

commit 83b0302d347a49f951e904184afe57ac3723476e upstream.

The regulator framework maintains a list of consumer regulators
for a regulator device and protects it from concurrent access using
the regulator device's mutex lock.

In the case of regulator_put() the consumer is removed and regulator
device's parameters are updated without holding the regulator device's
mutex. This would lead to a race condition between the regulator_put()
and any function which traverses the consumer list or modifies regulator
device's parameters.
Fix this race condition by holding the regulator device's mutex in case
of regulator_put.

Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
[bwh: Backported to 3.2:
 - Adjust context
 - Don't touch the comment; __regulator_put() has not been split out of
   regulator_put() here]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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