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| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2017-11-24 23:04:37 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-12-08 15:24:01 +0100 |
| commit | 7df66d778317353c94c3a2832cd26e320ca28b7d (patch) | |
| tree | 1d809005ba4840aa10fd58cf15b7306067839112 /drivers/media | |
| parent | media: ov7670: add V4L2_CID_TEST_PATTERN control (diff) | |
| download | linux-7df66d778317353c94c3a2832cd26e320ca28b7d.tar.xz linux-7df66d778317353c94c3a2832cd26e320ca28b7d.zip | |
media: v4l: mt9v032: Disable clock on error paths
mt9v032_power_on() leaves clk enabled in case of errors,
but it is not expected by its callers.
There is a similar problem in mt9v032_registered().
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/i2c/mt9v032.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/media/i2c/mt9v032.c b/drivers/media/i2c/mt9v032.c index 8a430640c85d..4de63b2df334 100644 --- a/drivers/media/i2c/mt9v032.c +++ b/drivers/media/i2c/mt9v032.c @@ -294,14 +294,22 @@ static int mt9v032_power_on(struct mt9v032 *mt9v032) /* Reset the chip and stop data read out */ ret = regmap_write(map, MT9V032_RESET, 1); if (ret < 0) - return ret; + goto err; ret = regmap_write(map, MT9V032_RESET, 0); if (ret < 0) - return ret; + goto err; + + ret = regmap_write(map, MT9V032_CHIP_CONTROL, + MT9V032_CHIP_CONTROL_MASTER_MODE); + if (ret < 0) + goto err; + + return 0; - return regmap_write(map, MT9V032_CHIP_CONTROL, - MT9V032_CHIP_CONTROL_MASTER_MODE); +err: + clk_disable_unprepare(mt9v032->clk); + return ret; } static void mt9v032_power_off(struct mt9v032 *mt9v032) @@ -876,6 +884,9 @@ static int mt9v032_registered(struct v4l2_subdev *subdev) /* Read and check the sensor version */ ret = regmap_read(mt9v032->regmap, MT9V032_CHIP_VERSION, &version); + + mt9v032_power_off(mt9v032); + if (ret < 0) { dev_err(&client->dev, "Failed reading chip version\n"); return ret; @@ -894,8 +905,6 @@ static int mt9v032_registered(struct v4l2_subdev *subdev) return -ENODEV; } - mt9v032_power_off(mt9v032); - dev_info(&client->dev, "%s detected at address 0x%02x\n", mt9v032->version->name, client->addr); |