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@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index bc8a3ed..222c03a 100644 (file)
--- 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;
 }