From 32758274dcdc733153c677a3e0e728049d97fe49 Mon Sep 17 00:00:00 2001 From: "Kim, Milo" Date: Tue, 23 Oct 2012 13:50:31 +1100 Subject: [PATCH] drivers/video/backlight/lp855x_bl.c: remove unnecessary mutex code The mutex for accessing lp855x registers is used in case of the user-space interaction. When the brightness is changed via sysfs, the mutex is required. But the backlight class device already provides it. Thus, the lp855x mutex is unnecessary. Signed-off-by: Milo(Woogyom) Kim Cc: Thierry Reding Cc: Richard Purdie Cc: Bryan Wu Signed-off-by: Andrew Morton --- drivers/video/backlight/lp855x_bl.c | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c index f6ad875b33f3..f7757cf7a2b2 100644 --- a/drivers/video/backlight/lp855x_bl.c +++ b/drivers/video/backlight/lp855x_bl.c @@ -35,7 +35,6 @@ struct lp855x { struct i2c_client *client; struct backlight_device *bl; struct device *dev; - struct mutex xfer_lock; struct lp855x_platform_data *pdata; struct pwm_device *pwm; }; @@ -44,14 +43,11 @@ static int lp855x_read_byte(struct lp855x *lp, u8 reg, u8 *data) { int ret; - mutex_lock(&lp->xfer_lock); ret = i2c_smbus_read_byte_data(lp->client, reg); if (ret < 0) { - mutex_unlock(&lp->xfer_lock); dev_err(lp->dev, "failed to read 0x%.2x\n", reg); return ret; } - mutex_unlock(&lp->xfer_lock); *data = (u8)ret; return 0; @@ -59,13 +55,7 @@ static int lp855x_read_byte(struct lp855x *lp, u8 reg, u8 *data) static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data) { - int ret; - - mutex_lock(&lp->xfer_lock); - ret = i2c_smbus_write_byte_data(lp->client, reg, data); - mutex_unlock(&lp->xfer_lock); - - return ret; + return i2c_smbus_write_byte_data(lp->client, reg, data); } static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr) @@ -281,8 +271,6 @@ static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id) lp->chip_id = id->driver_data; i2c_set_clientdata(cl, lp); - mutex_init(&lp->xfer_lock); - ret = lp855x_init_registers(lp); if (ret) { dev_err(lp->dev, "i2c communication err: %d", ret); -- 2.39.5