From: Mattias Wallin <mattias.wallin@stericsson.com>
Date: Thu, 4 Nov 2010 10:01:31 +0000 (+0100)
Subject: regulator: lock supply in regulator enable
X-Git-Tag: v2.6.37-rc5~35^2~3
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=3aa713e76e8f562c0d28faf18873c4f1836b17c9;p=~shefty%2Frdma-dev.git

regulator: lock supply in regulator enable

This patch add locks around regulator supply enable.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
---

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 711fa1722bc..27d062e1395 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1269,7 +1269,9 @@ static int _regulator_enable(struct regulator_dev *rdev)
 
 	/* do we need to enable the supply regulator first */
 	if (rdev->supply) {
+		mutex_lock(&rdev->supply->mutex);
 		ret = _regulator_enable(rdev->supply);
+		mutex_unlock(&rdev->supply->mutex);
 		if (ret < 0) {
 			printk(KERN_ERR "%s: failed to enable %s: %d\n",
 			       __func__, rdev_get_name(rdev), ret);