| Message ID | 1408516716-28828-1-git-send-email-LW@KARO-electronics.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Aug 20, 2014 at 08:38:36AM +0200, Lothar Waßmann wrote: > commit 257462dbf3ed ("pwm-backlight: switch to gpiod interface") > introduced a regression leading to acquiring a bogus GPIO-0 when > configured from DT without an 'enable-gpios' property. > The driver will happily accept the 0 initialized 'enable_gpio' member > of the struct platform_pwm_backlight_data as valid gpio number, and > request this GPIO as enable pin. In case of multiple driver instances, > the second will fail to register with the error message: > pwm-backlight backlight1.23: failed to request GPIO#0: -16 > > Fix this by setting enable_gpio in the pdata struct to -EINVAL. > > Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> > --- > drivers/video/backlight/pwm_bl.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c > index d7a3d13..e6ef6b4 100644 > --- a/drivers/video/backlight/pwm_bl.c > +++ b/drivers/video/backlight/pwm_bl.c > @@ -172,7 +172,7 @@ static int pwm_backlight_parse_dt(struct device *dev, > data->dft_brightness = value; > data->max_brightness--; > } > - > + data->enable_gpio = -EINVAL; I'd prefer to keep the blank line for readability. Other than that: Acked-by: Thierry Reding <treding@nvidia.com>
On Wed, 20 Aug 2014, Lothar Waßmann wrote: > commit 257462dbf3ed ("pwm-backlight: switch to gpiod interface") > introduced a regression leading to acquiring a bogus GPIO-0 when > configured from DT without an 'enable-gpios' property. > The driver will happily accept the 0 initialized 'enable_gpio' member > of the struct platform_pwm_backlight_data as valid gpio number, and > request this GPIO as enable pin. In case of multiple driver instances, > the second will fail to register with the error message: > pwm-backlight backlight1.23: failed to request GPIO#0: -16 > > Fix this by setting enable_gpio in the pdata struct to -EINVAL. > > Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> > --- > drivers/video/backlight/pwm_bl.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Applied to -fixes with Thierry's Ack and the blank line left. > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c > index d7a3d13..e6ef6b4 100644 > --- a/drivers/video/backlight/pwm_bl.c > +++ b/drivers/video/backlight/pwm_bl.c > @@ -172,7 +172,7 @@ static int pwm_backlight_parse_dt(struct device *dev, > data->dft_brightness = value; > data->max_brightness--; > } > - > + data->enable_gpio = -EINVAL; > return 0; > } >
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index d7a3d13..e6ef6b4 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -172,7 +172,7 @@ static int pwm_backlight_parse_dt(struct device *dev, data->dft_brightness = value; data->max_brightness--; } - + data->enable_gpio = -EINVAL; return 0; }
commit 257462dbf3ed ("pwm-backlight: switch to gpiod interface") introduced a regression leading to acquiring a bogus GPIO-0 when configured from DT without an 'enable-gpios' property. The driver will happily accept the 0 initialized 'enable_gpio' member of the struct platform_pwm_backlight_data as valid gpio number, and request this GPIO as enable pin. In case of multiple driver instances, the second will fail to register with the error message: pwm-backlight backlight1.23: failed to request GPIO#0: -16 Fix this by setting enable_gpio in the pdata struct to -EINVAL. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/video/backlight/pwm_bl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)