> -----Original Message----- > From: Dan Carpenter [mailto:error27@xxxxxxxxx] > Sent: Monday, March 21, 2011 10:09 AM > To: Janorkar, Mayuresh > Cc: Guennadi Liakhovetski; Magnus Damm; linux-fbdev@xxxxxxxxxxxxxxx; > kernel-janitors@xxxxxxxxxxxxxxx; Paul Mundt > Subject: Re: [patch] fbdev: sh_mobile_lcdc: checking NULL instead of > IS_ERR() > > On Mon, Mar 21, 2011 at 09:47:50AM +0530, Janorkar, Mayuresh wrote: > > > backlight_device_register() returns an ERR_PTR. It doesn't return > NULL. > > > > The patch is not applying on the master branch of fbdev tree. > > I could find another branch: fbdev/shmobile on the tree. > > It is a good idea to mention this in the description of the patch. > > > > Sorry, I'm working against linux-next so I wasn't aware. That's fine :). I saw fbdev in the subject line and To: Paul Mundt so thought this has been developed on fbdev master. But its good idea to mention the base of your patch. > > > > > > > Signed-off-by: Dan Carpenter <error27@xxxxxxxxx> > > > > > > diff --git a/drivers/video/sh_mobile_lcdcfb.c > > > b/drivers/video/sh_mobile_lcdcfb.c > > > index bf2629f..a53abe1 100644 > > > --- a/drivers/video/sh_mobile_lcdcfb.c > > > +++ b/drivers/video/sh_mobile_lcdcfb.c > > > @@ -1088,7 +1088,7 @@ static struct backlight_device > > > *sh_mobile_lcdc_bl_probe(struct device *parent, > > > > > > bl = backlight_device_register(ch->cfg.bl_info.name, parent, ch, > > > &sh_mobile_lcdc_bl_ops, NULL); > > > - if (!bl) { > > > + if (IS_ERR(bl)) { > > > dev_err(parent, "unable to register backlight device\n"); > > > > > > How about printing the error number here? > > > > Ok. That's a good idea. > > > > return NULL; > > > > Code is not checking for return value where this function is called. > > > > A code snippet where this function is called: > > /* probe the backlight is there is one defined */ > > if (ch->cfg.bl_info.max_brightness) > > ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch); > > > > If the return value is not checked then whats the use of return value? > > > > It is checked actually. Look at the places which would dereference > ->bl. Yes, got it, it is checked it in start and stop. > > > > } > > > -- > > > To unsubscribe from this list: send the line "unsubscribe linux-fbdev" > in > > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
