# RE: \[PATCH\] udlfb: Fix invalid return codes in edid sysfs entry store function

- From: Jingoo Han \<hidden\>
- Date: 2012-02-29 01:33:23 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2012/02/13462683
- Thread: https://ratatoskr.run/linux-fbdev/2012/02/13462681/t.md

```text

Hi.
> -----Original Message-----
> From: <redacted> [mailto:<redacted>] On Behalf Of Florian
> Tobias Schandinat
> Sent: Wednesday, February 29, 2012 1:14 AM
> To: Olivier Sobrie
> Cc: <redacted>; Bernie Thompson
> Subject: Re: [PATCH] udlfb: Fix invalid return codes in edid sysfs entry store function
> 
> [Cc'ing Bernie Thompson, the udlfb maintainer]
> @Bernie: Why don't you add an entry for it in MAINTAINERS?

I think so, too. :)
Bernie, it would be good to add you to MAINTAINERS as udlfb maintainer.

> 
> On 02/23/2012 07:53 AM, Olivier Sobrie wrote:
> > Return a negative errno instead of zero in the write function of
> > the sysfs entry in case of error.
> > Also add a check on the return value of dlfb_setup_modes().
> >
> > Signed-off-by: Olivier Sobrie <redacted>
> > ---
> >  drivers/video/udlfb.c |    9 ++++++---
> >  1 files changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
> > index a197731..abbc3fe 100644
> > --- a/drivers/video/udlfb.c
> > +++ b/drivers/video/udlfb.c
> > @@ -1427,19 +1427,22 @@ static ssize_t edid_store(
> >  	struct device *fbdev = container_of(kobj, struct device, kobj);
> >  	struct fb_info *fb_info = dev_get_drvdata(fbdev);
> >  	struct dlfb_data *dev = fb_info->par;
> > +	int ret;
> >
> >  	/* We only support write of entire EDID at once, no offset*/
> >  	if ((src_size != EDID_LENGTH) || (src_off != 0))
> > -		return 0;
> > +		return -EINVAL;
> >
> > -	dlfb_setup_modes(dev, fb_info, src, src_size);
> > +	ret = dlfb_setup_modes(dev, fb_info, src, src_size);
> > +	if (ret)
> > +		return ret;
> >
> >  	if (dev->edid && (memcmp(src, dev->edid, src_size) = 0)) {
> >  		pr_info("sysfs written EDID is new default\n");
> >  		dlfb_ops_set_par(fb_info);
> >  		return src_size;
> >  	} else
> > -		return 0;
> > +		return -EINVAL;
How about this? According to the coding style, it is more desirable to use braces.
Sorry for nitpicking. :)
 -  	} else
 -		return 0;
 +  	} else {
 +		return -EINVAL;
 +	}
> >  }
> >
> >  static ssize_t metrics_reset_store(struct device *fbdev,
> 
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```