linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915/selftest: Fix use of err in igt_reset_{fail, nop}

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Date:   Mon, 23 Aug 2021 12:08:37 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc:     John Harrison <John.C.Harrison@...el.com>,
        Matthew Brost <matthew.brost@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        kernel-janitors@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [Intel-gfx] [PATCH] drm/i915/selftest: Fix use of err in
 igt_reset_{fail, nop}_engine()

Ping? This is a pretty clear bug and it is not fixed in -next or
drm-intel at this point.

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@...cle.com>
> Signed-off-by: Nathan Chancellor <nathan@...nel.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