[Freedreno] [PATCH v2 2/3] drm/msm: Fix IS_ERR() vs NULL check in a5xx_submit_in_rb()

[Dmitry Baryshkov]

On Thu, 13 Jul 2023 at 22:08, Akhil P Oommen <quic_akhilpo at quicinc.com> wrote:
>
> On Thu, Jul 13, 2023 at 10:05:55AM +0800, Gaosheng Cui wrote:
> >
> > The msm_gem_get_vaddr() returns an ERR_PTR() on failure, we should
> > use IS_ERR() to check the return value.
> >
> > Fixes: 6a8bd08d0465 ("drm/msm: add sudo flag to submit ioctl")
> > Signed-off-by: Gaosheng Cui <cuigaosheng1 at huawei.com>
> > Reviewed-by: Abhinav Kumar <quic_abhinavk at quicinc.com>
> > ---
> >  drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > index a99310b68793..a499e3b350fc 100644
> > --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> > @@ -89,7 +89,7 @@ static void a5xx_submit_in_rb(struct msm_gpu *gpu, struct msm_gem_submit *submit
> >                        * since we've already mapped it once in
> >                        * submit_reloc()
> >                        */
> > -                     if (WARN_ON(!ptr))
> > +                     if (WARN_ON(IS_ERR(ptr)))
> nit: can we make this IS_ERR_OR_NULL() check to retain the current
> validation? A null is catastrophic here. Yeah, I see that the current
> implementation of ...get_vaddr() doesn't return a NULL.

I generally dislike IS_ERR_OR_NULL, as it is always (incorrectly)
paired with PTR_ERR. But in the case of void return it would be a
perfect fit.

>
> Reviewed-by: Akhil P Oommen <quic_akhilpo at quicinc.com>
>
> -Akhil
>
> >                               return;
> >
> >                       for (i = 0; i < dwords; i++) {
> > --
> > 2.25.1
> >



-- 
With best wishes
Dmitry