linux-kernel - Re: [PATCH linux-next] drm/i915/display: Delete redundant post

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Date:   Wed, 8 Dec 2021 15:04:17 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     cgel.zte@...il.com
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        David Airlie <airlied@...ux.ie>,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        luo penghao <luo.penghao@....com.cn>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] drm/i915/display: Delete redundant post_mask
 assignment

On Wed, Dec 08, 2021 at 07:46:19AM +0000, cgel.zte@...il.com wrote:
> From: luo penghao <luo.penghao@....com.cn>
> 
> This value will be overwritten by the following if statement, even
> if the if is not executed, the value will not be used
> 
> The clang_analyzer complains as follows:
> 
> Value stored to 'port_mask' is never read
> 
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: luo penghao <luo.penghao@....com.cn>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index bd18432..3aad0c3 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -2011,7 +2011,6 @@ void intel_ddi_sanitize_encoder_pll_mapping(struct intel_encoder *encoder)
>  			return;
>  	}
>  
> -	port_mask = BIT(encoder->port);
>  	ddi_clk_needed = encoder->base.crtc;
>  
>  	if (encoder->type == INTEL_OUTPUT_DSI) {

'port_mask' declaration could now be moved into this block.

> -- 
> 2.15.2
> 

-- 
Ville Syrjälä
Intel