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| author | Milo Kim <milo.kim@ti.com> | 2013-12-02 17:21:44 -0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@gmail.com> | 2014-01-10 14:48:07 -0800 |
| commit | e70988d1aaf73221355e06125c9937bd4b27761c (patch) | |
| tree | 8ea603b96e81f39b77696e59605fc53836750d3f /drivers/leds | |
| parent | 802eee95bde72fd0cd0f3a5b2098375a487d1eda (diff) | |
| download | linux-stable-e70988d1aaf73221355e06125c9937bd4b27761c.tar.gz linux-stable-e70988d1aaf73221355e06125c9937bd4b27761c.tar.bz2 linux-stable-e70988d1aaf73221355e06125c9937bd4b27761c.zip | |
leds: lp5521/5523: Remove duplicate mutex
It can be a problem when a pattern is loaded via the firmware interface.
LP55xx common driver has already locked the mutex in 'lp55xx_firmware_loaded()'.
So it should be deleted.
On the other hand, locks are required in store_engine_load()
on updating program memory.
Reported-by: Pali Rohár <pali.rohar@gmail.com>
Reported-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Cc: <stable@vger.kernel.org>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-lp5521.c | 12 | ||||
| -rw-r--r-- | drivers/leds/leds-lp5523.c | 12 |
2 files changed, 8 insertions, 16 deletions
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c index 05188351711d..a97263e902ff 100644 --- a/drivers/leds/leds-lp5521.c +++ b/drivers/leds/leds-lp5521.c @@ -244,18 +244,12 @@ static int lp5521_update_program_memory(struct lp55xx_chip *chip, if (i % 2) goto err; - mutex_lock(&chip->lock); - for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) { ret = lp55xx_write(chip, addr[idx] + i, pattern[i]); - if (ret) { - mutex_unlock(&chip->lock); + if (ret) return -EINVAL; - } } - mutex_unlock(&chip->lock); - return size; err: @@ -427,15 +421,17 @@ static ssize_t store_engine_load(struct device *dev, { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; + int ret; mutex_lock(&chip->lock); chip->engine_idx = nr; lp5521_load_engine(chip); + ret = lp5521_update_program_memory(chip, buf, len); mutex_unlock(&chip->lock); - return lp5521_update_program_memory(chip, buf, len); + return ret; } store_load(1) store_load(2) diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c index 6b553d9f4266..fd9ab5f61441 100644 --- a/drivers/leds/leds-lp5523.c +++ b/drivers/leds/leds-lp5523.c @@ -337,18 +337,12 @@ static int lp5523_update_program_memory(struct lp55xx_chip *chip, if (i % 2) goto err; - mutex_lock(&chip->lock); - for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) { ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]); - if (ret) { - mutex_unlock(&chip->lock); + if (ret) return -EINVAL; - } } - mutex_unlock(&chip->lock); - return size; err: @@ -548,15 +542,17 @@ static ssize_t store_engine_load(struct device *dev, { struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); struct lp55xx_chip *chip = led->chip; + int ret; mutex_lock(&chip->lock); chip->engine_idx = nr; lp5523_load_engine_and_select_page(chip); + ret = lp5523_update_program_memory(chip, buf, len); mutex_unlock(&chip->lock); - return lp5523_update_program_memory(chip, buf, len); + return ret; } store_load(1) store_load(2) |