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References: <20210813171158.2665823-1-nathan@kernel.org> <YSPyNZ3I1LgvDYSw@Ryzen-9-3900X.localdomain>
Subject: Re: [Intel-gfx] [PATCH] drm/i915/selftest: Fix use of err in igt_reset_{fail, nop}_engine()
Cc:     John Harrison <John.C.Harrison@intel.com>,
        Matthew Brost <matthew.brost@intel.com>,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
        kernel-janitors@vger.kernel.org,
        Dan Carpenter <dan.carpenter@oracle.com>
To:     Jani Nikula <jani.nikula@linux.intel.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>
From:   Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
Message-ID: <162979875184.5663.3119766810404831323@jlahtine-mobl.ger.corp.intel.com>
User-Agent: alot/0.8.1
Date:   Tue, 24 Aug 2021 12:52:31 +0300
Precedence: bulk

Quoting Nathan Chancellor (2021-08-23 22:08:37)
> Ping? This is a pretty clear bug and it is not fixed in -next or
> drm-intel at this point.

Pushed to drm-intel-gt-next with my R-b.

Regards, Joonas

> On Fri, Aug 13, 2021 at 10:11:58AM -0700, Nathan Chancellor wrote:
> > Clang warns:
> > 
> > In file included from drivers/gpu/drm/i915/gt/intel_reset.c:1514:
> > drivers/gpu/drm/i915/gt/selftest_hangcheck.c:465:62: warning: variable
> > 'err' is uninitialized when used here [-Wuninitialized]
> >         pr_err("[%s] Create context failed: %d!\n", engine->name, err);
> >                                                                   ^~~
> > ...
> > drivers/gpu/drm/i915/gt/selftest_hangcheck.c:580:62: warning: variable
> > 'err' is uninitialized when used here [-Wuninitialized]
> >         pr_err("[%s] Create context failed: %d!\n", engine->name, err);
> >                                                                   ^~~
> > ...
> > 2 warnings generated.
> > 
> > This appears to be a copy and paste issue. Use ce directly using the %pe
> > specifier to pretty print the error code so that err is not used
> > uninitialized in these functions.
> > 
> > Fixes: 3a7b72665ea5 ("drm/i915/selftest: Bump selftest timeouts for hangcheck")
> > Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> > Signed-off-by: Nathan Chancellor <nathan@kernel.org>
> > ---
> >  drivers/gpu/drm/i915/gt/selftest_hangcheck.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
> > index 08f011f893b2..2c1ed32ca5ac 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
> > @@ -462,7 +462,7 @@ static int igt_reset_nop_engine(void *arg)
> >  
> >               ce = intel_context_create(engine);
> >               if (IS_ERR(ce)) {
> > -                     pr_err("[%s] Create context failed: %d!\n", engine->name, err);
> > +                     pr_err("[%s] Create context failed: %pe!\n", engine->name, ce);
> >                       return PTR_ERR(ce);
> >               }
> >  
> > @@ -577,7 +577,7 @@ static int igt_reset_fail_engine(void *arg)
> >  
> >               ce = intel_context_create(engine);
> >               if (IS_ERR(ce)) {
> > -                     pr_err("[%s] Create context failed: %d!\n", engine->name, err);
> > +                     pr_err("[%s] Create context failed: %pe!\n", engine->name, ce);
> >                       return PTR_ERR(ce);
> >               }
> >  
> > 
> > base-commit: 927dfdd09d8c03ba100ed0c8c3915f8e1d1f5556
> > -- 
> > 2.33.0.rc2