[PATCH] backlight: lp855x_bl: Add missing mutex_unlock inlp855x_read_byte error path

[Axel Lin]

Signed-off-by: Axel Lin <axel.lin@xxxxxxxxx>
---
 drivers/video/backlight/lp855x_bl.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index 8f628b8..8bd0d75 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -41,6 +41,7 @@ static int lp855x_read_byte(struct lp855x *lp, u8 reg, u8 *data)
 	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;
 	}
-- 
1.7.5.4



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