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

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Date:   Fri, 13 Aug 2021 10:11:58 -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,
        Nathan Chancellor <nathan@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] drm/i915/selftest: Fix use of err in igt_reset_{fail,nop}_engine()

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