linux-kernel - Re: [PATCH][next] drm/komeda: remove redundant assignment to pointer disable

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Message-ID: <20191004192720.7eiqdvsm2yv62svg@e110455-lin.cambridge.arm.com>
Date:   Fri, 4 Oct 2019 20:27:20 +0100
From:   Liviu Dudau <liviu.dudau@....com>
To:     Colin King <colin.king@...onical.com>
Cc:     James Wang <james.qian.wang@....com>,
        Brian Starkey <brian.starkey@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] drm/komeda: remove redundant assignment to pointer
 disable_done

On Fri, Oct 04, 2019 at 05:21:56PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The pointer disable_done is being initialized with a value that
> is never read and is being re-assigned a little later on. The
> assignment is redundant and hence can be removed.

Not really true, isn't it? The re-assignment is done under the condition that
crtc->state->active is true. disable_done will be used regardless after the if
block, so we can't skip this initialisation.

Not sure why Coverity flags this, but I would NAK this patch.

Best regards,
Liviu

> 
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> index 75263d8cd0bd..9beeda04818b 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> @@ -296,7 +296,7 @@ komeda_crtc_atomic_disable(struct drm_crtc *crtc,
>  	struct komeda_crtc_state *old_st = to_kcrtc_st(old);
>  	struct komeda_pipeline *master = kcrtc->master;
>  	struct komeda_pipeline *slave  = kcrtc->slave;
> -	struct completion *disable_done = &crtc->state->commit->flip_done;
> +	struct completion *disable_done;
>  	bool needs_phase2 = false;
>  
>  	DRM_DEBUG_ATOMIC("CRTC%d_DISABLE: active_pipes: 0x%x, affected: 0x%x\n",
> -- 
> 2.20.1
> 

-- 
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