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gpiolib: fix device_create() result check

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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@ru.mvista.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergei Shtylyov 2009-11-11 14:26:50 -08:00 committed by Linus Torvalds
parent bcb3a1676b
commit d62668e1dd
1 changed files with 4 additions and 4 deletions
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8
drivers/gpio/gpiolib.c
View file

@ -661,7 +661,7 @@ int gpio_export(unsigned gpio, bool direction_may_change)
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 direction_may_change)
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_chip *chip)
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);