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From: "Christian König" <christian.koenig@amd.com>
To: Tuo Li <islituo@gmail.com>,
	alexander.deucher@amd.com, Xinhui.Pan@amd.com, airlied@linux.ie,
	daniel@ffwll.ch, sumit.semwal@linaro.org, airlied@redhat.com,
	Felix.Kuehling@amd.com, Oak.Zeng@amd.com, nirmoy.das@amd.com,
	tzimmermann@suse.de, Philip.Yang@amd.com
Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
	linaro-mm-sig@lists.linaro.org, baijiaju1990@gmail.com,
	TOTE Robot <oslab@tsinghua.edu.cn>
Subject: Re: [PATCH] drm/amdgpu: drop redundant null-pointer checks in amdgpu_ttm_tt_populate() and amdgpu_ttm_tt_unpopulate()
Date: Wed, 4 Aug 2021 08:49:12 +0200	[thread overview]
Message-ID: <f515880f-17f8-66b3-20d9-c1a46a252463@amd.com> (raw)
In-Reply-To: <20210804015132.29617-1-islituo@gmail.com>

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@tsinghua.edu.cn>
> Signed-off-by: Tuo Li <islituo@gmail.com>

Reviewed-by: Christian König <christian.koenig@amd.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;


  reply	other threads:[~2021-08-04  6:49 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04  1:51 Tuo Li
2021-08-04  6:49 ` Christian König [this message]
2021-08-05  4:32   ` Alex Deucher

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