linux-kernel - [RFT 3/6] regulator: max77802: Don't ignore return value of current opmode

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Date:	Tue, 04 Nov 2014 09:49:43 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [RFT 3/6] regulator: max77802: Don't ignore return value of current
 opmode

The return value of regmap_read() of current opmode for regulator was
silently ignored and whatever happened to be in 'val' variable was used
as new opmode. This could lead to using bogus opmode.

Don't ignore what regmap_read() returns. If it fails just fall back to
normal opmode.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
---
 drivers/regulator/max77802.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/max77802.c b/drivers/regulator/max77802.c
index a0d146278b76..7cbff7038b43 100644
--- a/drivers/regulator/max77802.c
+++ b/drivers/regulator/max77802.c
@@ -606,7 +606,13 @@ static int max77802_pmic_probe(struct platform_device *pdev)
 		config.of_node = pdata->regulators[i].of_node;
 
 		ret = regmap_read(iodev->regmap, regulators[i].enable_reg, &val);
-		val = val >> shift & MAX77802_OPMODE_MASK;
+		if (ret < 0) {
+			dev_warn(&pdev->dev,
+				"cannot read current mode for %d\n", i);
+			val = MAX77802_OPMODE_NORMAL;
+		} else {
+			val = val >> shift & MAX77802_OPMODE_MASK;
+		}
 
 		/*
 		 * If the regulator is disabled and the system warm rebooted,
-- 
1.9.1

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