linux-kernel - [PATCH] gpiolib: fix device

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Message-Id: <200910202035.23981.sshtylyov@ru.mvista.com>
Date:	Tue, 20 Oct 2009 20:35:23 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	linux-kernel@...r.kernel.org
Cc:	david-b@...bell.net, akpm@...ux-foundation.org
Subject: [PATCH] gpiolib: fix device_create() result check

In case of failure, device_create() returns not NULL but the error code.
The current code checks for non-NULL though which causes kernel oops in
sysfs_create_group() when device_create() fails.  Check for error using
IS_ERR() and propagate the error value using PTR_ERR() instead of fixed
-ENODEV code returned now...

Signed-off-by: Sergei Shtylyov <sshtylyov@...mvista.com>

 drivers/gpio/gpiolib.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

Index: linux-2.6/drivers/gpio/gpiolib.c
===================================================================
--- linux-2.6.orig/drivers/gpio/gpiolib.c
+++ linux-2.6/drivers/gpio/gpiolib.c
@@ -661,7 +661,7 @@ int gpio_export(unsigned gpio, bool dire
 
 		dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0),
 				desc, ioname ? ioname : "gpio%d", gpio);
-		if (dev) {
+		if (!IS_ERR(dev)) {
 			if (direction_may_change)
 				status = sysfs_create_group(&dev->kobj,
 						&gpio_attr_group);
@@ -679,7 +679,7 @@ int gpio_export(unsigned gpio, bool dire
 			if (status != 0)
 				device_unregister(dev);
 		} else
-			status = -ENODEV;
+			status = PTR_ERR(dev);
 		if (status == 0)
 			set_bit(FLAG_EXPORT, &desc->flags);
 	}
@@ -800,11 +800,11 @@ static int gpiochip_export(struct gpio_c
 	mutex_lock(&sysfs_lock);
 	dev = device_create(&gpio_class, chip->dev, MKDEV(0, 0), chip,
 				"gpiochip%d", chip->base);
-	if (dev) {
+	if (!IS_ERR(dev)) {
 		status = sysfs_create_group(&dev->kobj,
 				&gpiochip_attr_group);
 	} else
-		status = -ENODEV;
+		status = PTR_ERR(dev);
 	chip->exported = (status == 0);
 	mutex_unlock(&sysfs_lock);
 

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