From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FC9629CA for ; Tue, 24 Aug 2021 22:54:46 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 1A9836128A; Tue, 24 Aug 2021 22:54:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629845685; bh=61EGsvStJTvoj2rByjNfkTgYkBZ9S/mMONay7AcUprY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G2reUi7c4D2Gdx8CkPBA7QqrYRhpayxDLiITEUA35AdXbbbl8+OnyXMOglk8TnOU9 Gi8yDzqV8vrbH6rboARmfvIQEfJ+lCSVeT06ZHaCw2fLAy8IQlMOSM3tcK2uzvIKaZ ANN+X631EFzTy3QKG08vtwTDpgRn8cJRFTwks4ikjyYRmmrBV0Ag5MLCUSmXbEcwWy RNeSud//VpBm4b05r5fjuCC+15a7L9VaLbAAXbxFyihbzzOaI0lYfQcAv/Hwh5GxQj PqVvjb0VOb+nCGcO0eZoeEUFtv/LJGT3o0gbo56xshiPUNgkKuWK3VRSeyxefFHKIr yMkC+4ts0x/Hw== From: Nathan Chancellor To: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi Cc: Jason Ekstrand , =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Matthew Auld , "Michael J. Ruhl" , Nick Desaulniers , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, llvm@lists.linux.dev, Nathan Chancellor , Dan Carpenter Subject: [PATCH 1/3] drm/i915/selftests: Do not use import_obj uninitialized Date: Tue, 24 Aug 2021 15:54:25 -0700 Message-Id: <20210824225427.2065517-2-nathan@kernel.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210824225427.2065517-1-nathan@kernel.org> References: <20210824225427.2065517-1-nathan@kernel.org> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Bot: notify Content-Transfer-Encoding: 8bit Clang warns a couple of times: drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:63:6: warning: variable 'import_obj' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (import != &obj->base) { ^~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:80:22: note: uninitialized use occurs here i915_gem_object_put(import_obj); ^~~~~~~~~~ drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:63:2: note: remove the 'if' if its condition is always false if (import != &obj->base) { ^~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c:38:46: note: initialize the variable 'import_obj' to silence this warning struct drm_i915_gem_object *obj, *import_obj; ^ = NULL Shuffle the import_obj initialization above these if statements so that it is not used uninitialized. Fixes: d7b2cb380b3a ("drm/i915/gem: Correct the locking and pin pattern for dma-buf (v8)") Reported-by: Dan Carpenter Signed-off-by: Nathan Chancellor --- drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c index ffae7df5e4d7..532c7955b300 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c @@ -59,13 +59,13 @@ static int igt_dmabuf_import_self(void *arg) err = PTR_ERR(import); goto out_dmabuf; } + import_obj = to_intel_bo(import); if (import != &obj->base) { pr_err("i915_gem_prime_import created a new object!\n"); err = -EINVAL; goto out_import; } - import_obj = to_intel_bo(import); i915_gem_object_lock(import_obj, NULL); err = __i915_gem_object_get_pages(import_obj); @@ -176,6 +176,7 @@ static int igt_dmabuf_import_same_driver(struct drm_i915_private *i915, err = PTR_ERR(import); goto out_dmabuf; } + import_obj = to_intel_bo(import); if (import == &obj->base) { pr_err("i915_gem_prime_import reused gem object!\n"); @@ -183,8 +184,6 @@ static int igt_dmabuf_import_same_driver(struct drm_i915_private *i915, goto out_import; } - import_obj = to_intel_bo(import); - i915_gem_object_lock(import_obj, NULL); err = __i915_gem_object_get_pages(import_obj); if (err) { -- 2.33.0