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authorKim, Milo <Milo.Kim@ti.com>2012-12-17 16:00:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:16 -0800
commiteaa4d02fbaf49e57f8a18f68e736e34c514030a2 (patch)
tree9c9655309d7fa519713c277e9f7dd190ceda1c39 /drivers/video/backlight/lp855x_bl.c
parent8cc9764c9c7d01a6e2c3ddac8f0ac7716be01868 (diff)
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 <milo.kim@ti.com> Cc: Thierry Reding <thierry.reding@avionic-design.de> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Bryan Wu <bryan.wu@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video/backlight/lp855x_bl.c')
-rw-r--r--drivers/video/backlight/lp855x_bl.c14
1 files changed, 1 insertions, 13 deletions
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index b437541555ff..6e4db0c874c8 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);