linux-kernel - [PATCH] regulator: core: Correct return value check in regulator_resolve

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Date:	Thu, 17 Sep 2015 14:50:20 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	<broonie@...nel.org>
CC:	<lgirdwood@...il.com>, <bjorn.andersson@...ymobile.com>,
	<patches@...nsource.wolfsonmicro.com>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH] regulator: core: Correct return value check in regulator_resolve_supply

The ret pointer passed to regulator_dev_lookup is only filled with a
valid error code if regulator_dev_lookup returned NULL. Currently
regulator_resolve_supply checks this ret value before it checks if a
regulator was returned, this can result in valid regulator lookups being
ignored.

Fixes: 6261b06de565 ("regulator: Defer lookup of supply to regulator_get")
Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/regulator/core.c |   16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b616d34a..e5dbbe2f 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1394,15 +1394,15 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
 		return 0;
 
 	r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
-	if (ret == -ENODEV) {
-		/*
-		 * No supply was specified for this regulator and
-		 * there will never be one.
-		 */
-		return 0;
-	}
-
 	if (!r) {
+		if (ret == -ENODEV) {
+			/*
+			 * No supply was specified for this regulator and
+			 * there will never be one.
+			 */
+			return 0;
+		}
+
 		if (have_full_constraints()) {
 			r = dummy_regulator_rdev;
 		} else {
-- 
1.7.2.5

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