From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6783C433F5 for ; Thu, 9 Sep 2021 11:54:08 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8350861B95 for ; Thu, 9 Sep 2021 11:54:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 8350861B95 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 94C4D6E7E6; Thu, 9 Sep 2021 11:54:07 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0775D6E804 for ; Thu, 9 Sep 2021 11:54:07 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id BBF9D61B61; Thu, 9 Sep 2021 11:54:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631188446; bh=76pG/1mTrO5PLLh788TwM7n8iSFCwidakWpyicrLVjc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VDq3UAcUgqiUJbv4WiGfKOMVNUTb+VUBEU8sCkQ+Qoo8Fqz5NsJu+xUAcPNNxQwtK Qgricvk1qgMohn/AOZO6BFjCdecPgGqK5hYtiAyIBpS8Lztc+zA/pJldasdO2QCfhe ju3iNpgLQCBfplgyrkmNmwUhcVQp6LY64E15j93jrnts/R7x8T4PxM4pAFehi+55z0 U6aC6WqIMQ7ukGJE1/rAGIKKcQSlGRBC+7n4+XTi+EAokBmgYe3xz+HXkLfioC8nLv 93BnwSMFS2sMe8JeWIyQGm27Dt67G4BC4hZAjbL1jXURmbulpaPT0r3uEcL4vjioPR +z/PvIr9zsU1g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nathan Chancellor , kernel test robot , Inki Dae , Sasha Levin , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, clang-built-linux@googlegroups.com Subject: [PATCH AUTOSEL 5.10 130/176] drm/exynos: Always initialize mapping in exynos_drm_register_dma() Date: Thu, 9 Sep 2021 07:50:32 -0400 Message-Id: <20210909115118.146181-130-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210909115118.146181-1-sashal@kernel.org> References: <20210909115118.146181-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Nathan Chancellor [ Upstream commit c626f3864bbbb28bbe06476b0b497c1330aa4463 ] In certain randconfigs, clang warns: drivers/gpu/drm/exynos/exynos_drm_dma.c:121:19: warning: variable 'mapping' is uninitialized when used here [-Wuninitialized] priv->mapping = mapping; ^~~~~~~ drivers/gpu/drm/exynos/exynos_drm_dma.c:111:16: note: initialize the variable 'mapping' to silence this warning void *mapping; ^ = NULL 1 warning generated. This occurs when CONFIG_EXYNOS_IOMMU is enabled and both CONFIG_ARM_DMA_USE_IOMMU and CONFIG_IOMMU_DMA are disabled, which makes the code look like void *mapping; if (0) mapping = arm_iommu_create_mapping() else if (0) mapping = iommu_get_domain_for_dev() ... priv->mapping = mapping; Add an else branch that initializes mapping to the -ENODEV error pointer so that there is no more warning and the driver does not change during runtime. Reported-by: kernel test robot Signed-off-by: Nathan Chancellor Signed-off-by: Inki Dae Signed-off-by: Sasha Levin --- drivers/gpu/drm/exynos/exynos_drm_dma.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c b/drivers/gpu/drm/exynos/exynos_drm_dma.c index 0644936afee2..bf33c3084cb4 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dma.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c @@ -115,6 +115,8 @@ int exynos_drm_register_dma(struct drm_device *drm, struct device *dev, EXYNOS_DEV_ADDR_START, EXYNOS_DEV_ADDR_SIZE); else if (IS_ENABLED(CONFIG_IOMMU_DMA)) mapping = iommu_get_domain_for_dev(priv->dma_dev); + else + mapping = ERR_PTR(-ENODEV); if (IS_ERR(mapping)) return PTR_ERR(mapping); -- 2.30.2