linux-kernel - [PATCH] mfd: arizona: Check errors from regcache

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Message-Id: <1357319772-11347-1-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Fri,  4 Jan 2013 17:16:12 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] mfd: arizona: Check errors from regcache_sync()

If the control bus is unrelabile we may hit errors during regcache_sync(),
especially given that it tends to be one the most dense bursts of I/O in
many systems.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 2281e80..f8738aa 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -239,7 +239,12 @@ static int arizona_runtime_resume(struct device *dev)
 		return ret;
 	}
 
-	regcache_sync(arizona->regmap);
+	ret = regcache_sync(arizona->regmap);
+	if (ret != 0) {
+		dev_err(arizona->dev, "Failed to restore register cache\n");
+		regulator_disable(arizona->dcvdd);
+		return ret;
+	}
 
 	return 0;
 }
-- 
1.7.10.4

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