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backlight: adp88x0: Fix uninitialized variable use

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gcc correctly warns about both the adp8860 and adp8870 backlight
drivers using an uninitialized variable in their error handling
path:

drivers/video/backlight/adp8870_bl.c: In function 'adp8870_bl_ambient_light_zone_store':
drivers/video/backlight/adp8870_bl.c:811:11: warning: 'reg_val' may be used uninitialized in this function

This changes the code to only write back the data if it was
correctly read to start with.

As a side-note, the drivers are mostly identical, so I think they
should really be merged into one file to avoid having to fix every
bug twice.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Arnd Bergmann 2015-11-23 14:44:13 +01:00 committed by Lee Jones
parent 1ec218373b
commit 86c68e2fb3
2 changed files with 12 additions and 8 deletions
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10
drivers/video/backlight/adp8860_bl.c
View File

@ -621,10 +621,12 @@ static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
/* Set user supplied ambient light zone */
mutex_lock(&data->lock);
adp8860_read(data->client, ADP8860_CFGR, &reg_val);
reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
reg_val |= (val - 1) << CFGR_BLV_SHIFT;
adp8860_write(data->client, ADP8860_CFGR, reg_val);
ret = adp8860_read(data->client, ADP8860_CFGR, &reg_val);
if (!ret) {
reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
reg_val |= (val - 1) << CFGR_BLV_SHIFT;
adp8860_write(data->client, ADP8860_CFGR, reg_val);
}
mutex_unlock(&data->lock);
}

10
drivers/video/backlight/adp8870_bl.c
View File

@ -807,10 +807,12 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,
/* Set user supplied ambient light zone */
mutex_lock(&data->lock);
adp8870_read(data->client, ADP8870_CFGR, &reg_val);
reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
reg_val |= (val - 1) << CFGR_BLV_SHIFT;
adp8870_write(data->client, ADP8870_CFGR, reg_val);
ret = adp8870_read(data->client, ADP8870_CFGR, &reg_val);
if (!ret) {
reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
reg_val |= (val - 1) << CFGR_BLV_SHIFT;
adp8870_write(data->client, ADP8870_CFGR, reg_val);
}
mutex_unlock(&data->lock);
}