[PATCH] drm/msm: Upgrade gxpd checks to IS_ERR_OR_NULL

[Sean Paul]

On Wed, May 15, 2019 at 3:39 PM Jordan Crouse <jcrouse at codeaurora.org> wrote:
>
> On Wed, May 15, 2019 at 01:00:52PM -0400, Sean Paul wrote:
> > From: Sean Paul <seanpaul at chromium.org>
> >
> > dev_pm_domain_attach_by_name() can return NULL, so we should check for
> > that case when we're about to dereference gxpd.
> >
> > Fixes: 9325d4266afd ("drm/msm/gpu: Attach to the GPU GX power domain")
> > Cc: Jordan Crouse <jcrouse at codeaurora.org>
> > Cc: Rob Clark <robdclark at chromium.org>
> > Signed-off-by: Sean Paul <seanpaul at chromium.org>
>
> Reviewed-by: Jordan Crouse <jcrouse at codeauorora.org>
>

Thanks for the review, I've applied it to -misc-next-fixes with the
other msm fixes for 5.2


Sean

> > ---
> >  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > index 9155dafae2a90..38e2cfa9cec79 100644
> > --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> > @@ -747,7 +747,7 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
> >        * will make sure that the refcounting is correct in case we need to
> >        * bring down the GX after a GMU failure
> >        */
> > -     if (!IS_ERR(gmu->gxpd))
> > +     if (!IS_ERR_OR_NULL(gmu->gxpd))
> >               pm_runtime_get(gmu->gxpd);
> >
> >  out:
> > @@ -863,7 +863,7 @@ int a6xx_gmu_stop(struct a6xx_gpu *a6xx_gpu)
> >        * domain. Usually the GMU does this but only if the shutdown sequence
> >        * was successful
> >        */
> > -     if (!IS_ERR(gmu->gxpd))
> > +     if (!IS_ERR_OR_NULL(gmu->gxpd))
> >               pm_runtime_put_sync(gmu->gxpd);
> >
> >       clk_bulk_disable_unprepare(gmu->nr_clocks, gmu->clocks);
> > @@ -1234,7 +1234,7 @@ void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu)
> >
> >       pm_runtime_disable(gmu->dev);
> >
> > -     if (!IS_ERR(gmu->gxpd)) {
> > +     if (!IS_ERR_OR_NULL(gmu->gxpd)) {
> >               pm_runtime_disable(gmu->gxpd);
> >               dev_pm_domain_detach(gmu->gxpd, false);
> >       }
> > --
> > Sean Paul, Software Engineer, Google / Chromium OS
> >
>
> --
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