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

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Date:   Mon, 7 Oct 2019 16:25:05 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     Liviu Dudau <liviu.dudau@....com>,
        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 10:53:44PM +0100, Colin Ian King wrote:
> On 04/10/2019 20:27, Liviu Dudau wrote:
> > 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.
> 
> I'm patching against the driver from linux-next so I believe this is OK
> for that. I believe your statement is true against linux which does not
> have commit:
> 
> d6cb013579e743bc7bc5590ca35a1943f2b8f3c8
> Author: Lowry Li (Arm Technology China) <Lowry.Li@....com>
> Date:   Fri Sep 6 07:18:06 2019 +0000
> 

It really does help reviewing patches when this is mentioned in the
commit message.

There is some debate about whether this should be mentioned as a Fixes
since it doesn't fix a bug.  I initialy felt it shouldn't be, but now
I think enough people think it should be listed as Fixes that I must be
wrong.  Either way, it's very useful information.

The other thing is that soon get_maintainer.pl will start CC'ing people
from the Fixes tag and right now Lowry Li is not CC'd so that's
unfortunate.

regards,
dan carpenter