linux-kernel - [PATCH] regulator: core: Prioritise consumer mappings over regulator name

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Message-ID: <1497280672-24011-1-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date:   Mon, 12 Jun 2017 16:17:52 +0100
From:   Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:     <broonie@...nel.org>
CC:     <lgirdwood@...il.com>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>
Subject: [PATCH] regulator: core: Prioritise consumer mappings over regulator name

Currently, when looking up a regulator supply, the regulator name
takes priority over the consumer mappings. As there are a lot of
regulator names that are in fairly common use (VDD, MICVDD, etc.) this
can easily lead to obtaining the wrong supply, when a system contains
two regulators that share a name.

The explicit consumer mappings contain much less ambiguity as they
specify both a name and a consumer device. As such prioritise those if
one exists and only fall back to the regulator name if there are no
matching explicit mappings.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/regulator/core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 919b7f1..d257952 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1490,8 +1490,6 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
 		devname = dev_name(dev);

 	r = regulator_lookup_by_name(supply);
-	if (r)
-		return r;

 	mutex_lock(&regulator_list_mutex);
 	list_for_each_entry(map, &regulator_map_list, list) {
-- 
2.1.4