When possible use dev_err_probe help to properly deal with the PROBE_DEFER error, the benefit is that DEFER issue will be logged in the devices_deferred debugfs file. And using dev_err_probe() can reduce code size, the error value gets printed.

Signed-off-by: Cai Huoqing caihuoqing@baidu.com --- drivers/gpu/drm/panel/panel-novatek-nt39016.c | 20 +++++++------------ 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt39016.c b/drivers/gpu/drm/panel/panel-novatek-nt39016.c index f8151fe3ac9a..d036853db865 100644 --- a/drivers/gpu/drm/panel/panel-novatek-nt39016.c +++ b/drivers/gpu/drm/panel/panel-novatek-nt39016.c @@ -258,16 +258,13 @@ static int nt39016_probe(struct spi_device *spi) return -EINVAL;

panel->supply = devm_regulator_get(dev, "power"); - if (IS_ERR(panel->supply)) { - dev_err(dev, "Failed to get power supply\n"); - return PTR_ERR(panel->supply); - } + if (IS_ERR(panel->supply)) + return dev_err_probe(dev, PTR_ERR(panel->supply), + "Failed to get power supply\n");

panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); - if (IS_ERR(panel->reset_gpio)) { - dev_err(dev, "Failed to get reset GPIO\n"); - return PTR_ERR(panel->reset_gpio); - } + if (IS_ERR(panel->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(panel->reset_gpio), "Failed to get reset GPIO\n");

spi->bits_per_word = 8; spi->mode = SPI_MODE_3 | SPI_3WIRE; @@ -287,11 +284,8 @@ static int nt39016_probe(struct spi_device *spi) DRM_MODE_CONNECTOR_DPI);

err = drm_panel_of_backlight(&panel->drm_panel); - if (err) { - if (err != -EPROBE_DEFER) - dev_err(dev, "Failed to get backlight handle\n"); - return err; - } + if (err) + return dev_err_probe(dev, err, "Failed to get backlight handle\n");

drm_panel_add(&panel->drm_panel);