From patchwork Tue Apr 26 08:20:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 567905 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 7FB85C433FE for ; Tue, 26 Apr 2022 08:49:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344156AbiDZIwe (ORCPT ); Tue, 26 Apr 2022 04:52:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345764AbiDZIra (ORCPT ); Tue, 26 Apr 2022 04:47:30 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 271E6A76FB; Tue, 26 Apr 2022 01:37:44 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id AE3C3B81CFA; Tue, 26 Apr 2022 08:37:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0B769C385A0; Tue, 26 Apr 2022 08:37:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650962261; bh=jFm8Koe9x0fNpJvJozkZL3Fjf/sZ/Xq/QG5v5NdJk2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NiVnhdl66aFSCoTogcV1sAhXCMyXdu8DQ7cU95KdE9zeJej5T9huth6otwgd4/jM5 6UfhGYps6FNIxSPfaGlzgWAoHfqpoRUN0jaImKmMB0nOIM2pmsBiSfY1cLAHs/RaU3 hM6hZWuIGt1TZIp1695JUKCxawPD58akJK2Tlp7U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mike Rapoport , Christoph Hellwig , David Hildenbrand , Will Deacon , Georgi Djakov Subject: [PATCH 5.15 006/124] dma-mapping: remove bogus test for pfn_valid from dma_map_resource Date: Tue, 26 Apr 2022 10:20:07 +0200 Message-Id: <20220426081747.474819433@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081747.286685339@linuxfoundation.org> References: <20220426081747.286685339@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mike Rapoport commit a9c38c5d267cb94871dfa2de5539c92025c855d7 upstream. dma_map_resource() uses pfn_valid() to ensure the range is not RAM. However, pfn_valid() only checks for availability of the memory map for a PFN but it does not ensure that the PFN is actually backed by RAM. As dma_map_resource() is the only method in DMA mapping APIs that has this check, simply drop the pfn_valid() test from dma_map_resource(). Link: https://lore.kernel.org/all/20210824173741.GC623@arm.com/ Signed-off-by: Mike Rapoport Reviewed-by: Christoph Hellwig Acked-by: David Hildenbrand Link: https://lore.kernel.org/r/20210930013039.11260-2-rppt@kernel.org Signed-off-by: Will Deacon Fixes: 859a85ddf90e ("mm: remove pfn_valid_within() and CONFIG_HOLES_IN_ZONE") Link: https://lore.kernel.org/r/Yl0IZWT2nsiYtqBT@linux.ibm.com Signed-off-by: Georgi Djakov Signed-off-by: Greg Kroah-Hartman --- kernel/dma/mapping.c | 4 ---- 1 file changed, 4 deletions(-) --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -296,10 +296,6 @@ dma_addr_t dma_map_resource(struct devic if (WARN_ON_ONCE(!dev->dma_mask)) return DMA_MAPPING_ERROR; - /* Don't allow RAM to be mapped */ - if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr)))) - return DMA_MAPPING_ERROR; - if (dma_map_direct(dev, ops)) addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs); else if (ops->map_resource)