linux-kernel - [PATCH] regulator: catch some registration errors

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Message-Id: <1230728059-9392-1-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Wed, 31 Dec 2008 12:54:19 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Liam Girdwood <lrg@...mlogic.co.uk>
Cc:	linux-kernel@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: catch some registration errors

From: David Brownell <dbrownell@...rs.sourceforge.net>

Prevent registration of duplicate "struct regulator" names.
They'd be unavailable, and clearly indicate something wrong.

[Edited to remove check for NULL consumer device until we have a
solution for things like cpufreq -- broonie]

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/regulator/core.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 895f738..fcac9e5 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -775,6 +775,20 @@ static int set_consumer_device_supply(struct regulator_dev *rdev,
 	if (supply == NULL)
 		return -EINVAL;
 
+	list_for_each_entry(node, &regulator_map_list, list) {
+		if (consumer_dev != node->dev)
+			continue;
+		if (strcmp(node->supply, supply) != 0)
+			continue;
+
+		dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
+				dev_name(&node->regulator->dev),
+				node->regulator->desc->name,
+				supply,
+				dev_name(&rdev->dev), rdev->desc->name);
+		return -EBUSY;
+	}
+
 	node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
 	if (node == NULL)
 		return -ENOMEM;
-- 
1.5.6.3

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