As GPIO probe function "devm_gpiod_get_optional()" may return error code, driver should identify GPIO desc as NULL to avoid crash.

Acked-by: Tzung-Bi Shih tzungbi@google.com Signed-off-by: Xin Ji xji@analogixsemi.com --- drivers/gpu/drm/bridge/analogix/anx7625.c | 9 +++++++++ 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 001fb39d9919..652ae814246d 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -1098,9 +1098,18 @@ static void anx7625_init_gpio(struct anx7625_data *platform) /* Gpio for chip power enable */ platform->pdata.gpio_p_on = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR_OR_NULL(platform->pdata.gpio_p_on)) { + DRM_DEV_DEBUG_DRIVER(dev, "no enable gpio found\n"); + platform->pdata.gpio_p_on = NULL; + } + /* Gpio for chip reset */ platform->pdata.gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR_OR_NULL(platform->pdata.gpio_reset)) { + DRM_DEV_DEBUG_DRIVER(dev, "no reset gpio found\n"); + platform->pdata.gpio_reset = NULL; + }

if (platform->pdata.gpio_p_on && platform->pdata.gpio_reset) { platform->pdata.low_power_mode = 1;