From patchwork Wed Nov 1 09:36:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Inki Dae X-Patchwork-Id: 740311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF8BAC4332F for ; Wed, 1 Nov 2023 09:37:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230178AbjKAJhE (ORCPT ); Wed, 1 Nov 2023 05:37:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37052 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230216AbjKAJhC (ORCPT ); Wed, 1 Nov 2023 05:37:02 -0400 Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41066103 for ; Wed, 1 Nov 2023 02:36:57 -0700 (PDT) Received: by mail-pg1-x531.google.com with SMTP id 41be03b00d2f7-5b9a7357553so2203153a12.0 for ; Wed, 01 Nov 2023 02:36:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1698831417; x=1699436217; darn=vger.kernel.org; h=message-id:date:subject:cc:to:from:sender:from:to:cc:subject:date :message-id:reply-to; bh=LyXL+8kMJ/1G6Wc6ZGN/nIRPqs6F9spUVK3ynSWmCqU=; b=XeUhafg7f2Td1gBnS5LiSvjkBD+98U4ktqs+QyFgh7BbZ6gLfiPdF0bnWFOYrK03iz HnuDRnY2F+e7lhas2XKI9Dtb+h7hyF8D7i3bq3gqT6mjDY2pR/UlTAT+gBaAO0LINaWV 9P6A4MwCWjo5M8z0v34JgHBt0NW2V5AMnrHBE4p0qjwwY1VFfKcZvkheqWgZ0AOFU3To 8sj30SYqlbFkb7tBl/pbwRp3kiyePELQZrLGx8wGoN4gNOy71DVDQVgGjJ0CkrqEyUmh ZObUj8tYGLWX62u3ZvgfqRDPB7o2GO6hx6YcfDuNLD/tK9XWlpOVsYWFkRtDj41JSios 0tug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698831417; x=1699436217; h=message-id:date:subject:cc:to:from:sender:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=LyXL+8kMJ/1G6Wc6ZGN/nIRPqs6F9spUVK3ynSWmCqU=; b=sLm0gP/AQAgJIOebEpAfmAtE5ZXPIHUU8iZ/RNM4LPrqRMmLxV8cgd/EnfRMHmLiXQ T9vMGpy0CIiOUHDc5VhayQ/SsDPLn9xr/d9MvqQLhH8F5lK9YfxyA3de4jRUb6orXSFz VDx1NzgFHJozKbYiYBbTf6wchzFoEB4mNLnwy6XtMD56HdflcveEDGGR+zHGiwwl2XF8 xEmS/JLT7HnPqagwETGMPy/HcWx94Kxr/9ipxjqMyQJniSQYfdR0ldOGYM23PT2rAjJ0 MTBCcibJ1GxVwnA5+gwRWu50k6oZL3FdCw0LuKuVAwltZ2wbVKjqXyzocsYKJdWgETt1 K0bw== X-Gm-Message-State: AOJu0YzwRTWZq+1bBpJC4LiKjHEuV9Jr1Daz/x3QnDcyhI+Q155IP4hY qDxTfc+KXiuP7Vf9FcokK9X6f/jqVY4ksg== X-Google-Smtp-Source: AGHT+IGVAKVpfpaa+6wP/Jcv5qLFNWpIv2d9/MOxDigrVyBuAn8rspFyVvLWgGqGX985E9GijFUIUg== X-Received: by 2002:a05:6300:8083:b0:16b:9541:85e6 with SMTP id ap3-20020a056300808300b0016b954185e6mr18133836pzc.60.1698831416626; Wed, 01 Nov 2023 02:36:56 -0700 (PDT) Received: from daeinki-virtual-machine.localdomain ([58.124.60.88]) by smtp.gmail.com with ESMTPSA id ne19-20020a17090b375300b002776288537fsm527321pjb.53.2023.11.01.02.36.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Nov 2023 02:36:56 -0700 (PDT) Sender: Inki Dae From: Inki Dae To: dri-devel@lists.freedesktop.org Cc: linux-samsung-soc@vger.kernel.org, Inki Dae Subject: [PATCH] drm/exynos: fix a wrong error checking Date: Wed, 1 Nov 2023 18:36:51 +0900 Message-Id: <20231101093651.28343-1-inki.dae@samsung.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Fix a wrong error checking in exynos_drm_dma.c module. In the exynos_drm_register_dma function, both arm_iommu_create_mapping() and iommu_get_domain_for_dev() functions are expected to return NULL as an error. However, the error checking is performed using the statement if(IS_ERR(mapping)), which doesn't provide a suitable error value. So check if 'mapping' is NULL, and if it is, return ERR_PTR(-ENODEV). This issue[1] was reported by Dan. [1] https://www.spinics.net/lists/dri-devel/msg418271.html Reported-by : Dan Carpenter Signed-off-by: Inki Dae --- drivers/gpu/drm/exynos/exynos_drm_dma.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c b/drivers/gpu/drm/exynos/exynos_drm_dma.c index a971590b81323..6d73d4dca583e 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dma.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c @@ -107,18 +107,16 @@ int exynos_drm_register_dma(struct drm_device *drm, struct device *dev, return 0; if (!priv->mapping) { - void *mapping; + void *mapping = NULL; if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) mapping = arm_iommu_create_mapping(&platform_bus_type, 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); + if (!mapping) + return PTR_ERR(-ENODEV); priv->mapping = mapping; }