From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=AYvg=P2=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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=-2.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED,
	HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT
	autolearn=unavailable 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 7FC69C43387
	for <linuxppc-dev@archiver.kernel.org>; Fri, 18 Jan 2019 11:42:01 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(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 E522F20652
	for <linuxppc-dev@archiver.kernel.org>; Fri, 18 Jan 2019 11:42:00 +0000 (UTC)
Authentication-Results: mail.kernel.org;
	dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NM1ZpJGN"
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E522F20652
Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 43gzYy742FzDr11
	for <linuxppc-dev@archiver.kernel.org>; Fri, 18 Jan 2019 22:41:58 +1100 (AEDT)
Authentication-Results: lists.ozlabs.org; spf=none (mailfrom)
 smtp.mailfrom=bombadil.srs.infradead.org (client-ip=2607:7c80:54:e::133;
 helo=bombadil.infradead.org;
 envelope-from=batv+606761215ffed07ca90d+5626+infradead.org+hch@bombadil.srs.infradead.org;
 receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org;
 dmarc=none (p=none dis=none) header.from=lst.de
Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key;
 unprotected) header.d=infradead.org header.i=@infradead.org
 header.b="NM1ZpJGN"; dkim-atps=neutral
Received: from bombadil.infradead.org (bombadil.infradead.org
 [IPv6:2607:7c80:54:e::133])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (No client certificate requested)
 by lists.ozlabs.org (Postfix) with ESMTPS id 43gzT56csFzDqsm
 for <linuxppc-dev@lists.ozlabs.org>; Fri, 18 Jan 2019 22:37:41 +1100 (AEDT)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
 d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding:
 MIME-Version:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:
 Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender:
 Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id:
 List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive;
 bh=OX54bckM/rwEp4H5la6/F38I3bmsjj9BqreNm9vFgKU=; b=NM1ZpJGN9GIEtFPLireLSQM58
 lhPpr/NkFXHPqraZrNpHSvJLMGN3QcWxFpLzHsPoDAuzLVJzJ993PUCF4EPUvJzk4fNQhaBsXonLv
 6Iwd3IME6U01AO10NdOLMhmeTXKyZlI4J427ly8wY3KJouQfjgzRMfwPXxDRaqBfGpxAIJTfjey0e
 WJO8y+debPaWL6RXafOmM5uyii4G8RQxAp4OuF7sjymQWJB5cRHnTP+qQe4x8YakfdKL4pBaAtKL5
 yKcK6uOyCZ4zj+oFyYGnSwLugNEvfkLXjr4e7r537Y3r2CCn6weEt47SUv084M1Dr1TKFS20smn/O
 gG/XOrKmQ==;
Received: from 089144210168.atnat0019.highway.a1.net ([89.144.210.168]
 helo=localhost)
 by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux))
 id 1gkSSo-0005OJ-Oj; Fri, 18 Jan 2019 11:37:31 +0000
From: Christoph Hellwig <hch@lst.de>
To: Pawel Osciak <pawel@osciak.com>,
 Marek Szyprowski <m.szyprowski@samsung.com>,
 Kyungmin Park <kyungmin.park@samsung.com>,
 =?UTF-8?q?Niklas=20S=C3=B6derlund?= <niklas.soderlund+renesas@ragnatech.se>
Subject: fix a layering violation in videobuf2 and improve dma_map_resource v2
Date: Fri, 18 Jan 2019 12:37:24 +0100
Message-Id: <20190118113727.3270-1-hch@lst.de>
X-Mailer: git-send-email 2.20.1
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
X-SRS-Rewrite: SMTP reverse-path rewritten from <hch@infradead.org> by
 bombadil.infradead.org. See http://www.infradead.org/rpr.html
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: Russell King <linux@armlinux.org.uk>, linux-kernel@vger.kernel.org,
 iommu@lists.linux-foundation.org, Mauro Carvalho Chehab <mchehab@kernel.org>,
 linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org,
 linux-media@vger.kernel.org
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Hi all,

this series fixes a rather gross layering violation in videobuf2, which
pokes into arm DMA mapping internals to get a DMA address for memory that
does not have a page structure, and to do so fixes up the dma_map_resource
implementation to not provide a somewhat dangerous default and improve
the error handling.

Changes since v1:
 - don't apply bus offsets in dma_direct_map_resource