linux-kernel - [PATCH] max8907: fix use of possibly NULL idata

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Date:	Thu, 23 Aug 2012 12:19:18 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Axel Lin <axel.lin@...il.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	Gyungoh Yoo <jack.yoo@...im-ic.com>,
	linux-kernel@...r.kernel.org, Stephen Warren <swarren@...dia.com>
Subject: [PATCH] max8907: fix use of possibly NULL idata

From: Stephen Warren <swarren@...dia.com>

If a regulator is not used by a board, it's quite legitimate not to
provide platform data or a device tree node to configure it (i.e.
regulator_init_data). In that case, during MAX8907 regulator's
probe(), the idata variable will be NULL for that regulator. Prevent
dereferincing it.

If the MBATT regulator's init_data is not specified, or no name was
specified in the constraints, the regulator will be named based on
the regulator descriptor, so initialize mbatt_rail_name from there.

Signed-off-by: Stephen Warren <swarren@...dia.com>
---
 drivers/regulator/max8907-regulator.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/regulator/max8907-regulator.c b/drivers/regulator/max8907-regulator.c
index 3a5104f..e97af8e 100644
--- a/drivers/regulator/max8907-regulator.c
+++ b/drivers/regulator/max8907-regulator.c
@@ -323,7 +323,10 @@ static __devinit int max8907_regulator_probe(struct platform_device *pdev)
 
 		switch (pmic->desc[i].id) {
 		case MAX8907_MBATT:
-			mbatt_rail_name = idata->constraints.name;
+			if (idata && idata->constraints.name)
+				mbatt_rail_name = idata->constraints.name;
+			else
+				mbatt_rail_name = pmic->desc[i].name;
 			break;
 		case MAX8907_BBAT:
 		case MAX8907_SDBY:
-- 
1.7.0.4

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