linux-kernel - [123/152] watchdog: Fix null pointer dereference while accessing rdc321x platform

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Message-Id: <20110106002308.334528428@clark.site>
Date:	Wed, 05 Jan 2011 16:23:42 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Florian Fainelli <florian@...nwrt.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [123/152] watchdog: Fix null pointer dereference while accessing rdc321x platform_data

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Florian Fainelli <florian@...nwrt.org>

commit 3b3c1f24e96c411a95daabb6af9e09c5381f713b upstream.

rdc321x-wdt currently fetches its driver specific data by using the
platform_device->platform_data pointer, this is wrong because the mfd
device which registers our platform_device has been added using
mfd_add_device() which sets the platform_device->driver_data pointer
instead.

Signed-off-by: Florian Fainelli <florian@...nwrt.org>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/watchdog/rdc321x_wdt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/watchdog/rdc321x_wdt.c
+++ b/drivers/watchdog/rdc321x_wdt.c
@@ -231,7 +231,7 @@ static int __devinit rdc321x_wdt_probe(s
 	struct resource *r;
 	struct rdc321x_wdt_pdata *pdata;
 
-	pdata = pdev->dev.platform_data;
+	pdata = platform_get_drvdata(pdev);
 	if (!pdata) {
 		dev_err(&pdev->dev, "no platform data supplied\n");
 		return -ENODEV;


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