linux-kernel - Re: [PATCH][next] drm/amd/display: remove redundant assignment to status

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Date:   Fri, 31 May 2019 20:19:03 +0000
From:   Harry Wentland <hwentlan@....com>
To:     Colin King <colin.king@...onical.com>,
        "Koo, Anthony" <Anthony.Koo@....com>,
        "Wentland, Harry" <Harry.Wentland@....com>,
        "Li, Sun peng (Leo)" <Sunpeng.Li@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Zhou, David(ChunMing)" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] drm/amd/display: remove redundant assignment to
 status

On 2019-05-30 12:12 p.m., Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The variable status is initialized with a value that is never read
> and status is reassigned several statements later. This initialization
> is redundant and can be removed.
> 
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> index 65d6caedbd82..cf6166a1be53 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> @@ -2367,7 +2367,7 @@ static bool retrieve_link_cap(struct dc_link *link)
>  	union down_stream_port_count down_strm_port_count;
>  	union edp_configuration_cap edp_config_cap;
>  	union dp_downstream_port_present ds_port = { 0 };
> -	enum dc_status status = DC_ERROR_UNEXPECTED;
> +	enum dc_status status;

Not sure this improves the situation.

I'd prefer to have a default here in case someone changes the code below
and forgets to set the status.

Harry

>  	uint32_t read_dpcd_retry_cnt = 3;
>  	int i;
>  	struct dp_sink_hw_fw_revision dp_hw_fw_revision;
>