Hi Alexey,
   thanks for the patch

On Sun, Dec 30, 2018 at 12:35:20AM +0300, Alexey Khoroshilov wrote:
> If gpiod_get_optional() fails in tw9910_power_on(), clk is left undisabled.
>

Correct, thanks for spotting this.

I think pdn_gpio should also be handled if rstb_gpio fails.
What's your opinion?

Thanks
  j

> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
> ---
>  drivers/media/i2c/tw9910.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/media/i2c/tw9910.c b/drivers/media/i2c/tw9910.c
> index a54548cc4285..109770d678d2 100644
> --- a/drivers/media/i2c/tw9910.c
> +++ b/drivers/media/i2c/tw9910.c
> @@ -610,6 +610,7 @@ static int tw9910_power_on(struct tw9910_priv *priv)
>  					     GPIOD_OUT_LOW);
>  	if (IS_ERR(priv->rstb_gpio)) {
>  		dev_info(&client->dev, "Unable to get GPIO \"rstb\"");
> +		clk_disable_unprepare(priv->clk);
>  		return PTR_ERR(priv->rstb_gpio);
>  	}
>
> --
> 2.7.4
>