From patchwork Sat May 27 13:47:41 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sricharan Ramabadhran X-Patchwork-Id: 9751857 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4B69D60249 for ; Sat, 27 May 2017 13:48:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 275F028380 for ; Sat, 27 May 2017 13:48:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 089F728475; Sat, 27 May 2017 13:48:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8660528380 for ; Sat, 27 May 2017 13:48:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757039AbdE0NsZ (ORCPT ); Sat, 27 May 2017 09:48:25 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:38576 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756921AbdE0NsX (ORCPT ); Sat, 27 May 2017 09:48:23 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id BC7E16146C; Sat, 27 May 2017 13:48:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1495892902; bh=VycdsDBIttxdL/47bSckbgGRonLvI/CDt2UpBoZtH/Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hmgDXp4AdDT2I1enFJ7RbGC7j5a6mkSrOVKsF81S9WuwpNFgTPxuMRBzHOkkHJM/C WY0GXDi8Zg68Fw0bJ5mEaZrrhmiXb6iQ/wd/sbebkDiTCcs4hCnkUQT7BIChxeceES VdjoG9RK3QaXHJ9WER7eMDrDzRfZ3hZDefeKhdW4= Received: from srichara-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: sricharan@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 549B4613BE; Sat, 27 May 2017 13:48:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1495892900; bh=VycdsDBIttxdL/47bSckbgGRonLvI/CDt2UpBoZtH/Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BeyZgjkf6XWTL5fZ9B4RR8nIbyup8PNji75hKQURDhnwQ9mKElAMGepzbhLO6gWdn 8SCKxC0w70YOvD1xKEgVvYrRDrh5dRARkkO3J9QdWE/WxXD4p4Eq2aJ4AuCc2CHk54 lba8zDgdqSjKJeyJq1zFLrSZJWkyI6G3uV0BhRrI= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 549B4613BE Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=sricharan@codeaurora.org From: Sricharan R To: robin.murphy@arm.com, will.deacon@arm.com, joro@8bytes.org, lorenzo.pieralisi@arm.com, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, m.szyprowski@samsung.com, bhelgaas@google.com, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, tn@semihalf.com, hanjun.guo@linaro.org, okaya@codeaurora.org, robh+dt@kernel.org, frowand.list@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, sudeep.holla@arm.com, rjw@rjwysocki.net, lenb@kernel.org, catalin.marinas@arm.com, arnd@arndb.de, linux-arch@vger.kernel.org, laurent.pinchart@ideasonboard.com, j.neuschaefer@gmx.net, geert@linux-m68k.org, magnus.damm@gmail.com, nwatters@codeaurora.org, linux@armlinux.org.uk Cc: sricharan@codeaurora.org Subject: [PATCH v6 2/6] iommu: of: Ignore all errors except EPROBE_DEFER Date: Sat, 27 May 2017 19:17:41 +0530 Message-Id: <1495892865-9506-2-git-send-email-sricharan@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1495892865-9506-1-git-send-email-sricharan@codeaurora.org> References: <1495892865-9506-1-git-send-email-sricharan@codeaurora.org> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP While deferring the probe of IOMMU masters, xlate and add_device callbacks called from of_iommu_configure can pass back error values like -ENODEV, which means the IOMMU cannot be connected with that master for real reasons. Before the IOMMU probe deferral, all such errors were ignored. Now all those errors are propagated back, killing the master's probe for such errors. Instead ignore all the errors except EPROBE_DEFER, which is the only one of concern and let the master work without IOMMU, thus restoring the old behavior. Also make explicit that of_dma_configure handles only -EPROBE_DEFER from of_iommu_configure. Fixes: 7b07cbefb68d ("iommu: of: Handle IOMMU lookup failure with deferred probing or error") Reported-by: Geert Uytterhoeven Tested-by: Magnus Damn Signed-off-by: Sricharan R --- drivers/iommu/of_iommu.c | 6 ++++++ drivers/of/device.c | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index e6e9bec..19779b8 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -237,6 +237,12 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, ops = ERR_PTR(err); } + /* Ignore all other errors apart from EPROBE_DEFER */ + if (IS_ERR(ops) && (PTR_ERR(ops) != -EPROBE_DEFER)) { + dev_dbg(dev, "Adding to IOMMU failed: %ld\n", PTR_ERR(ops)); + ops = NULL; + } + return ops; } diff --git a/drivers/of/device.c b/drivers/of/device.c index 9416d05..28c38c7 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -144,8 +144,8 @@ int of_dma_configure(struct device *dev, struct device_node *np) coherent ? " " : " not "); iommu = of_iommu_configure(dev, np); - if (IS_ERR(iommu)) - return PTR_ERR(iommu); + if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER) + return -EPROBE_DEFER; dev_dbg(dev, "device is%sbehind an iommu\n", iommu ? " " : " not ");