linux-kernel - [PATCH] regulator: Only apply voltage constraints from consumers that set them

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Message-Id: <1305405754-23256-1-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Sat, 14 May 2011 13:42:34 -0700
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Liam Girdwood <lrg@...com>
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	David Collins <collinsd@...eaurora.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: Only apply voltage constraints from consumers that set them

When applying the set_voltage() requests from consumers skip over those
consumers that haven't set anything, otherwise we'll come out with a
maximum voltage of zero.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/regulator/core.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 051a45d..60ae920 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -161,6 +161,13 @@ static int regulator_check_consumers(struct regulator_dev *rdev,
 	struct regulator *regulator;
 
 	list_for_each_entry(regulator, &rdev->consumer_list, list) {
+		/*
+		 * Assume consumers that didn't say anything are OK
+		 * with anything in the constraint range.
+		 */
+		if (!regulator->min_uV && !regulator->max_uV)
+			continue;
+
 		if (*max_uV > regulator->max_uV)
 			*max_uV = regulator->max_uV;
 		if (*min_uV < regulator->min_uV)
-- 
1.7.5.1

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