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drivers/video/backlight/lcd.c: return ENXIO when ops functions cannot be called

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Previously, when ops functions cannot be called, lcd_show_contrast() and
lcd_store_contrast() returned 0, instead of ENXIO.

Thus, in this case, a local variable 'rc' for return value should be
initialized as ENXIO, after kstrtoul() is called.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jingoo Han 2012-12-17 16:01:10 -08:00 committed by Linus Torvalds
parent 2fe2380e35
commit 424e06e3da
1 changed files with 6 additions and 2 deletions
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8
drivers/video/backlight/lcd.c
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@ -108,7 +108,7 @@ static ssize_t lcd_show_power(struct device *dev, struct device_attribute *attr,
static ssize_t lcd_store_power(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int rc = -ENXIO;
int rc;
struct lcd_device *ld = to_lcd_device(dev);
unsigned long power;
@ -116,6 +116,8 @@ static ssize_t lcd_store_power(struct device *dev,
if (rc)
return rc;
rc = -ENXIO;
mutex_lock(&ld->ops_lock);
if (ld->ops && ld->ops->set_power) {
pr_debug("set power to %lu\n", power);
@ -144,7 +146,7 @@ static ssize_t lcd_show_contrast(struct device *dev,
static ssize_t lcd_store_contrast(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
int rc = -ENXIO;
int rc;
struct lcd_device *ld = to_lcd_device(dev);
unsigned long contrast;
@ -152,6 +154,8 @@ static ssize_t lcd_store_contrast(struct device *dev,
if (rc)
return rc;
rc = -ENXIO;
mutex_lock(&ld->ops_lock);
if (ld->ops && ld->ops->set_contrast) {
pr_debug("set contrast to %lu\n", contrast);