Hello Chuhong,
Is this check necessary ?
since looking into code it seems to me devm_gpiod_get_optional() can only
return NULL in case of error due to following check in devm_gpiod_get_index_optional()
if (IS_ERR(desc)) {
if (PTR_ERR(desc) == -ENOENT)
return NULL;
}
And in that case reset_gpio is not used
Regards
Mickael
On 10/16/19 12:56, Chuhong Yuan wrote:
> mipid02_probe misses a check for devm_gpiod_get_optional and may miss
> the failure.
> Add a check to fix the problem.
>
> Signed-off-by: Chuhong Yuan <hslester96@xxxxxxxxx>
> ---
> drivers/media/i2c/st-mipid02.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/media/i2c/st-mipid02.c b/drivers/media/i2c/st-mipid02.c
> index 81285b8d5cfb..d38e888b0a43 100644
> --- a/drivers/media/i2c/st-mipid02.c
> +++ b/drivers/media/i2c/st-mipid02.c
> @@ -971,6 +971,9 @@ static int mipid02_probe(struct i2c_client *client)
> bridge->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> GPIOD_OUT_HIGH);
>
> + if (IS_ERR(bridge->reset_gpio))
> + return PTR_ERR(bridge->reset_gpio);
> +
> ret = mipid02_get_regulators(bridge);
> if (ret) {
> dev_err(dev, "failed to get regulators %d", ret);
>
