linux-kernel - Re: [PATCH] drm/amd/display: Fix identical code for different branches

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Date:   Fri, 16 Jul 2021 19:10:33 +0200
From:   Len Baker <len.baker@....com>
To:     Joe Perches <joe@...ches.com>
Cc:     Len Baker <len.baker@....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@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Wenjing Liu <wenjing.liu@....com>,
        Martin Tsai <martin.tsai@....com>,
        Kees Cook <keescook@...omium.org>,
        George Shen <George.Shen@....com>,
        Yu-ting Shen <Yu-ting.Shen@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: Fix identical code for different
 branches

On Sun, Jul 11, 2021 at 10:45:48AM -0700, Joe Perches wrote:
> On Sun, 2021-07-11 at 19:24 +0200, Len Baker wrote:
> > The branches of the "if" statement are the same. So remove the
> > unnecessary if and goto statements.
> >
> > Addresses-Coverity-ID: 1456916 ("Identical code for different branches")
> > Fixes: 4c283fdac08ab ("drm/amd/display: Add HDCP module")
> > Signed-off-by: Len Baker <len.baker@....com>
>
> I'm not a big fan of this type of change.
>
> It's currently the same style used for six tests in this function
> and changing this last one would just make it harder to see the
> code blocks as consistent.
>
> I doubt any reasonable compiler would produce different objects.

Ok, thanks for the review. I leave it as is.

> > diff --git a/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c b/drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.c
> []
> > @@ -305,10 +305,8 @@ static enum mod_hdcp_status wait_for_ready(struct mod_hdcp *hdcp,
> >  				hdcp, "bcaps_read"))
> >  			goto out;
> >  	}
> > -	if (!mod_hdcp_execute_and_set(check_ksv_ready,
> > -			&input->ready_check, &status,
> > -			hdcp, "ready_check"))
> > -		goto out;
> > +	mod_hdcp_execute_and_set(check_ksv_ready, &input->ready_check, &status,
> > +				 hdcp, "ready_check");
> >  out:
> >  	return status;
> >  }
> > --
> > 2.25.1
> >

Thanks,
Len