linux-kernel - Re: [PATCH] drm/amd/display: remove redundant null pointer check before kfree

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Date:   Wed, 30 Oct 2019 13:36:40 +0000
From:   Harry Wentland <hwentlan@....com>
To:     zhong jiang <zhongjiang@...wei.com>,
        "Wentland, Harry" <Harry.Wentland@....com>,
        "Li, Sun peng (Leo)" <Sunpeng.Li@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>
CC:     "Koenig, Christian" <Christian.Koenig@....com>,
        "Zhou, David(ChunMing)" <David1.Zhou@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amd/display: remove redundant null pointer check
 before kfree

On 2019-10-29 9:57 p.m., zhong jiang wrote:
> kfree has taken null pointer into account. hence it is safe to remove
> the unnecessary check.
> 
> Signed-off-by: zhong jiang <zhongjiang@...wei.com>

Reviewed-by: Harry Wentland <harry.wentland@....com>

Harry

> ---
>  drivers/gpu/drm/amd/display/dc/hdcp/hdcp_msg.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/hdcp/hdcp_msg.c b/drivers/gpu/drm/amd/display/dc/hdcp/hdcp_msg.c
> index cf6ef38..6f730b5 100644
> --- a/drivers/gpu/drm/amd/display/dc/hdcp/hdcp_msg.c
> +++ b/drivers/gpu/drm/amd/display/dc/hdcp/hdcp_msg.c
> @@ -174,9 +174,7 @@ static bool hdmi_14_process_transaction(
>  			link->ctx,
>  			link,
>  			&i2c_command);
> -
> -	if (buff)
> -		kfree(buff);
> +	kfree(buff);
>  
>  	return result;
>  }
>