linux-kernel - Re: [kbuild] drivers/gpu/drm/msm/adreno/a3xx_gpu.c:600 a3xx_gpu_init() error: passing non negative 1 to ERR

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Date:   Fri, 16 Apr 2021 07:33:36 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Rob Clark <robdclark@...omium.org>
Cc:     Akhil P Oommen <akhilpo@...eaurora.org>, kbuild@...ts.01.org,
        lkp@...el.com, kbuild-all@...ts.01.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [kbuild] drivers/gpu/drm/msm/adreno/a3xx_gpu.c:600
 a3xx_gpu_init() error: passing non negative 1 to ERR_PTR

On Thu, Apr 15, 2021 at 04:21:01PM -0700, Rob Clark wrote:
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  571         icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem");
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  572         ret = IS_ERR(icc_path);
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  573         if (ret)
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  574                 goto fail;
> > >
> > > IS_ERR() returns/true false so this will lead to an Oops in the caller.
> > >
> > >       icc_path = devm_of_icc_get(&pdev->dev, "gfx-mem");
> > >       if (IS_ERR(icc_path)) {
> > >               ret = PTR_ERR(icc_path);
> > >               goto fail;
> > >       }
> > Agree.
> >
> > >
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  575
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  576         ocmem_icc_path = devm_of_icc_get(&pdev->dev, "ocmem");
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  577         ret = IS_ERR(ocmem_icc_path);
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  578         if (ret) {
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  579                 /* allow -ENODATA, ocmem icc is optional */
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  580                 if (ret != -ENODATA)
> > > 5785dd7a8ef0de Akhil P Oommen 2020-10-28  581                         goto fail;
> > >
> > > Same.  ret is true/false so it can't be equal to -ENODATA, plus the
> > > caller will Oops.
> > >
> > > Btw, this patch removed the assignments:
> > >
> > >               gpu->icc_path = of_icc_get(dev, "gfx-mem");
> > >               gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
> > >
> > > So I think "gpu->icc_path" and "gpu->ocmem_icc_path" are always
> > > NULL/unused and they should be removed.
> > >
> > Agree. Will share a fix.
> > Thanks, Dan.
> 
> gpu->ocmem_icc_path/icc_path is used on older devices.. it sounds like
> we broke some older devices and no one has noticed yet?

This is error paths and dead code.  Probably no one is affected in
real life.

regards,
dan carpenter