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Message-ID: <7a16f713-b8ca-d46c-a18d-d48e6938be16@amd.com>
Date: Tue, 10 Jan 2023 10:54:58 -0500
From: Rodrigo Siqueira Jordao <Rodrigo.Siqueira@....com>
To: Deepak R Varma <drv@...lo.com>,
Harry Wentland <harry.wentland@....com>,
Leo Li <sunpeng.li@....com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: Saurabh Singh Sengar <ssengar@...rosoft.com>,
Praveen Kumar <kumarpraveen@...ux.microsoft.com>
Subject: Re: [PATCH] drm/amd/display: No need for Null pointer check before
kfree
On 12/27/22 13:39, Deepak R Varma wrote:
> kfree() & vfree() internally performs NULL check on the pointer handed
> to it and take no action if it indeed is NULL. Hence there is no need
> for a pre-check of the memory pointer before handing it to
> kfree()/vfree().
>
> Issue reported by ifnullfree.cocci Coccinelle semantic patch script.
>
> Signed-off-by: Deepak R Varma <drv@...lo.com>
> ---
> drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c | 3 +--
> drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c | 3 +--
> 2 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c
> index 3ce0ee0d012f..694a9d3d92ae 100644
> --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c
> +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c
> @@ -577,8 +577,7 @@ void dcn3_clk_mgr_construct(
>
> void dcn3_clk_mgr_destroy(struct clk_mgr_internal *clk_mgr)
> {
> - if (clk_mgr->base.bw_params)
> - kfree(clk_mgr->base.bw_params);
> + kfree(clk_mgr->base.bw_params);
>
> if (clk_mgr->wm_range_table)
> dm_helpers_free_gpu_mem(clk_mgr->base.ctx, DC_MEM_ALLOC_TYPE_GART,
> diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
> index 200fcec19186..ba9814f88f48 100644
> --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
> +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
> @@ -783,8 +783,7 @@ void dcn32_clk_mgr_construct(
>
> void dcn32_clk_mgr_destroy(struct clk_mgr_internal *clk_mgr)
> {
> - if (clk_mgr->base.bw_params)
> - kfree(clk_mgr->base.bw_params);
> + kfree(clk_mgr->base.bw_params);
>
> if (clk_mgr->wm_range_table)
> dm_helpers_free_gpu_mem(clk_mgr->base.ctx, DC_MEM_ALLOC_TYPE_GART,
> --
> 2.34.1
>
>
>
Hi,
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
And applied to amd-staging-drm-next.
Thanks
Siqueira
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