linux-kernel - [PATCH 2.6.33] power_supply: Handle missing platform data gracefully

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Message-Id: <1264625001-3963-1-git-send-email-broonie@opensource.wolfsonmicro.com>
Date:	Wed, 27 Jan 2010 20:43:21 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	Marek Vasut <marek.vasut@...il.com>, linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 2.6.33] power_supply: Handle missing platform data gracefully

Don't unconditionally dereference the WM97xx core platform data since
it may not be present, causing an oops.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/power/wm97xx_battery.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/power/wm97xx_battery.c b/drivers/power/wm97xx_battery.c
index fa39e75..6ea3cb5 100644
--- a/drivers/power/wm97xx_battery.c
+++ b/drivers/power/wm97xx_battery.c
@@ -175,8 +175,14 @@ static int __devinit wm97xx_bat_probe(struct platform_device *dev)
 		dev_err(&dev->dev, "Do not pass platform_data through "
 			"wm97xx_bat_set_pdata!\n");
 		return -EINVAL;
-	} else
-		pdata = wmdata->batt_pdata;
+	}
+
+	if (!wmdata) {
+		dev_err(&dev->dev, "No platform data supplied\n");
+		return -EINVAL;
+	}
+
+	pdata = wmdata->batt_pdata;
 
 	if (dev->id != -1)
 		return -EINVAL;
-- 
1.6.6

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