linux-kernel - Re: [PATCH] drm/amdgpu: drop redundant null-pointer checks in amdgpu_ttm_tt_populate() and amdgpu_ttm_tt

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Message-ID: <CADnq5_MSp=PAqbaTrS771ssKJzVpT2LyDTjZCSx2hh-DFo3MXg@mail.gmail.com>
Date:   Thu, 5 Aug 2021 00:32:47 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Christian König <christian.koenig@....com>
Cc:     Tuo Li <islituo@...il.com>,
        "Deucher, Alexander" <alexander.deucher@....com>,
        xinhui pan <Xinhui.Pan@....com>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Dave Airlie <airlied@...hat.com>,
        "Kuehling, Felix" <Felix.Kuehling@....com>,
        Oak Zeng <Oak.Zeng@....com>, Nirmoy Das <nirmoy.das@....com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        "Yang, Philip" <Philip.Yang@....com>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-media <linux-media@...r.kernel.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        TOTE Robot <oslab@...nghua.edu.cn>
Subject: Re: [PATCH] drm/amdgpu: drop redundant null-pointer checks in
 amdgpu_ttm_tt_populate() and amdgpu_ttm_tt_unpopulate()

Applied.  Thanks!

Alex

On Wed, Aug 4, 2021 at 2:49 AM Christian König <christian.koenig@....com> wrote:
>
> Am 04.08.21 um 03:51 schrieb Tuo Li:
> > The varialbe gtt in the function amdgpu_ttm_tt_populate() and
> > amdgpu_ttm_tt_unpopulate() is guaranteed to be not NULL in the context.
> > Thus the null-pointer checks are redundant and can be dropped.
> >
> > Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
> > Signed-off-by: Tuo Li <islituo@...il.com>
>
> Reviewed-by: Christian König <christian.koenig@....com>
>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > index 3a55f08e00e1..719539bd6c44 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > @@ -1121,7 +1121,7 @@ static int amdgpu_ttm_tt_populate(struct ttm_device *bdev,
> >       struct amdgpu_ttm_tt *gtt = (void *)ttm;
> >
> >       /* user pages are bound by amdgpu_ttm_tt_pin_userptr() */
> > -     if (gtt && gtt->userptr) {
> > +     if (gtt->userptr) {
> >               ttm->sg = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
> >               if (!ttm->sg)
> >                       return -ENOMEM;
> > @@ -1146,7 +1146,7 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
> >       struct amdgpu_ttm_tt *gtt = (void *)ttm;
> >       struct amdgpu_device *adev;
> >
> > -     if (gtt && gtt->userptr) {
> > +     if (gtt->userptr) {
> >               amdgpu_ttm_tt_set_user_pages(ttm, NULL);
> >               kfree(ttm->sg);
> >               ttm->sg = NULL;
>