linux-kernel - Re: [PATCH] drm: msm: Check cmd_db_read_aux

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Message-ID: <20181129224234.GD32306@hector.attlocal.net>
Date:   Thu, 29 Nov 2018 16:42:34 -0600
From:   Andy Gross <andy.gross@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        kbuild test robot <lkp@...el.com>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Evan Green <evgreen@...omium.org>,
        Rob Clark <robdclark@...il.com>
Subject: Re: [PATCH] drm: msm: Check cmd_db_read_aux_data() for failure

On Thu, Nov 29, 2018 at 04:36:00PM -0600, Andy Gross wrote:
> On Thu, Nov 29, 2018 at 08:38:26AM -0800, Stephen Boyd wrote:
> > We need to check the call to cmd_db_read_aux_data() for the error case,
> > so that we don't continue and use potentially uninitialized values for
> > 'pri_count' and 'sec_count'. Otherwise, we get the following compiler
> > warnings:
> > 
> >    drivers/gpu/drm/msm/adreno/a6xx_gmu.c: In function 'a6xx_gmu_rpmh_arc_votes_init.isra.12':
> >    drivers/gpu/drm/msm/adreno/a6xx_gmu.c:943:12: warning: 'pri_count' is used uninitialized in this function [-Wuninitialized]
> >      pri_count >>= 1;
> >                ^~~
> >    drivers/gpu/drm/msm/adreno/a6xx_gmu.c:948:12: warning: 'sec_count' may be used uninitialized in this function
> > [-Wmaybe-uninitialized]
> >      sec_count >>= 1;
> >                ^~~
> > 
> > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > Reported-by: kbuild test robot <lkp@...el.com>
> > Cc: Jordan Crouse <jcrouse@...eaurora.org>
> > Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Cc: Evan Green <evgreen@...omium.org>
> > Cc: Jordan Crouse <jcrouse@...eaurora.org>
> > Cc: Rob Clark <robdclark@...il.com>
> > Fixes: ed3cafa79ea7 ("soc: qcom: cmd-db: Stop memcpy()ing in cmd_db_read_aux_data()")
> > Signed-off-by: Stephen Boyd <swboyd@...omium.org>

On second thought, this needs to go through drm tree.

Reviewed-by: Andy Gross <andy.gross@...aro.org>