Re: [Outreachy kernel] [PATCH DRM] drm: msm: adreno: Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) +PTR_ERR

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On Fri, Oct 19, 2018 at 09:19:32AM +0200, Daniel Vetter wrote:
> On Fri, Oct 19, 2018 at 08:18:52AM +0200, Julia Lawall wrote:
> > On Fri, 19 Oct 2018, Mamta Shukla wrote:
> > > Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR because its
> > > better to have inlined function rather than code-opened implementation.
> > 
> > 
> > Just for your information, people have mixed feelings about this.  In your
> > case, it's probably fine, because this is the only if in the function.
> > But when there is a series of if (...) return; followed by a return 0; at
> > the end, people ofen prefer to keep it as it is, so the last case doesn't
> > look different than the others.
> 
> Yeah I asked the maintainer for this driver for an ack, the other patches
> look good, will merged them as soon as I have the answer for this one
> here.
> 
> Mamta, since you'll have a few things merged already with these I think
> it's a good time to start looking into bigger tasks and figuring out what
> you might want to do in your internship:
> 
> https://dri.freedesktop.org/docs/drm/gpu/todo.html
> 
> Since this todo list is very unstructured it's best to discuss a bit over
> irc what you would want to, and what makes sense as an internship.

> Thanks, Daniel
> > 
> > julia
> > 

I'm not the maintainer but this seems reasonable to me. Yay negative lines.

Jordan

> > >
> > > Signed-off-by: Mamta Shukla <mamtashukla555@xxxxxxxxx>
> > > ---
> > >  drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 5 +----
> > >  1 file changed, 1 insertion(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > > index 6a68493..b751b76 100644
> > > --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > > +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > > @@ -1222,10 +1222,7 @@ static int a5xx_crashdumper_init(struct msm_gpu *gpu,
> > >  		SZ_1M, MSM_BO_UNCACHED, gpu->aspace,
> > >  		&dumper->bo, &dumper->iova);
> > >
> > > -	if (IS_ERR(dumper->ptr))
> > > -		return PTR_ERR(dumper->ptr);
> > > -
> > > -	return 0;
> > > +	return PTR_ERR_OR_ZERO(dumper->ptr);
> > >  }
> > >
> > >  static void a5xx_crashdumper_free(struct msm_gpu *gpu,
> > > --
> > > 1.9.1
> > >
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> > >
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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