On Fri, Feb 15, 2013 at 6:26 AM, Arnd Bergmann <a...@arndb.de> wrote: > Patch fe527ea5a "mfd: max8925: Support dt for backlight" > added a new function for DT probing but introduced a > build warning for the case where CONFIG_OF is disabled: > > drivers/video/backlight/max8925_bl.c: In function 'max8925_backlight_probe': > drivers/video/backlight/max8925_bl.c:177:3: warning: statement with no effect > [-Wunused-value] > > A much nicer fix is to use the IS_ENABLED keyword to > have the same effect of dropping the device tree specific > function when it's not needed. > > Signed-off-by: Arnd Bergmann <a...@arndb.de> > Cc: Qing Xu <qi...@marvell.com> > Cc: Haojian Zhuang <haojian.zhu...@gmail.com> > Cc: Samuel Ortiz <sa...@linux.intel.com> > --- > drivers/video/backlight/max8925_bl.c | 6 +----- > 1 file changed, 1 insertion(+), 5 deletions(-) > > diff --git a/drivers/video/backlight/max8925_bl.c > b/drivers/video/backlight/max8925_bl.c > index 5ca11b0..9958fb1 100644 > --- a/drivers/video/backlight/max8925_bl.c > +++ b/drivers/video/backlight/max8925_bl.c > @@ -101,14 +101,13 @@ static const struct backlight_ops max8925_backlight_ops > = { > .get_brightness = max8925_backlight_get_brightness, > }; > > -#ifdef CONFIG_OF > static int max8925_backlight_dt_init(struct platform_device *pdev, > struct max8925_backlight_pdata *pdata) > { > struct device_node *nproot = pdev->dev.parent->of_node, *np; > int dual_string; > > - if (!nproot) > + if (!nproot || !IS_ENABLED(CONFIG_OF)) > return -ENODEV; > np = of_find_node_by_name(nproot, "backlight"); > if (!np) { > @@ -120,9 +119,6 @@ static int max8925_backlight_dt_init(struct > platform_device *pdev, > pdata->dual_string = dual_string; > return 0; > } > -#else > -#define max8925_backlight_dt_init(x, y) (-1) > -#endif > > static int max8925_backlight_probe(struct platform_device *pdev) > { > -- > 1.8.1.2 >
Acked-by: Haojian Zhuang <haojian.zhu...@gmail.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/