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authorMilo Kim <milo.kim@ti.com>2013-12-02 17:21:44 -0800
committerBryan Wu <cooloney@gmail.com>2014-01-10 14:48:07 -0800
commite70988d1aaf73221355e06125c9937bd4b27761c (patch)
tree8ea603b96e81f39b77696e59605fc53836750d3f /drivers/leds/leds-lp5523.c
parent802eee95bde72fd0cd0f3a5b2098375a487d1eda (diff)
downloadlinux-e70988d1aaf73221355e06125c9937bd4b27761c.tar.bz2
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/leds-lp5523.c')
-rw-r--r--drivers/leds/leds-lp5523.c12
1 files changed, 4 insertions, 8 deletions
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)