From patchwork Thu May 18 14:54:14 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sricharan Ramabadhran X-Patchwork-Id: 764030 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3wTDlX6Y8Rz9ryT for ; Fri, 19 May 2017 00:56:08 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=codeaurora.org header.i=@codeaurora.org header.b="YgnhvK8T"; dkim=pass (1024-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="N7lcu8OW"; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933271AbdEROzy (ORCPT ); Thu, 18 May 2017 10:55:54 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:33814 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932680AbdEROyo (ORCPT ); Thu, 18 May 2017 10:54:44 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 9F23560F65; Thu, 18 May 2017 14:54:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1495119283; bh=mTIHDySefmGneQHLuZWRY/evLKZHa1fhodRMmZTk8cY=; h=From:To:Cc:Subject:Date:From; b=YgnhvK8T5HA1N+QLczttBc6BOAKHFP6nXh0+U7emUsAMwZ/k9EBy7ort49fOuBLhl gIATIObNZBnPga3qslzbZ7kKY5O5D/Mq2IVy701DLejNJD8ftbPEyqxlokuGSCMBXc U756vYi+0nagrtVao1PpdWuHRtSEDys1tD9k2RI4= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_SIGNED, T_DKIM_INVALID autolearn=no autolearn_force=no version=3.4.0 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 4B81760E0E; Thu, 18 May 2017 14:54:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1495119272; bh=mTIHDySefmGneQHLuZWRY/evLKZHa1fhodRMmZTk8cY=; h=From:To:Cc:Subject:Date:From; b=N7lcu8OWAoPbngyMFDVfRGpoPJNrsWilrynIP3QD+81HsKg3uN/T8pgq0wv4L2xKO Vwd3KGemdQxR4pqHKn3D8dv46lbmPiTd8AijhGvaqIf5T45LVtF7BhXEfCZGZ+7uN8 npKcIzsPQQvrmYn3np5zkAYjvAq2bXaz7yQ85Ml8= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 4B81760E0E 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 Cc: sricharan@codeaurora.org Subject: [PATCH V4 1/4] iommu: of: Fix check for returning EPROBE_DEFER Date: Thu, 18 May 2017 20:24:14 +0530 Message-Id: <1495119257-26724-1-git-send-email-sricharan@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Now with IOMMU probe deferral, we return -EPROBE_DEFER for masters that are connected to an IOMMU which is not probed yet, but going to get probed, so that we can attach the correct dma_ops. So while trying to defer the probe of the master, check if the of_iommu node that it is connected to is marked in DT as 'status=disabled', then the IOMMU is never is going to get probed. So simply return NULL and let the master work without an IOMMU. Fixes: 7b07cbefb68d ("iommu: of: Handle IOMMU lookup failure with deferred probing or error") Signed-off-by: Sricharan R Reported-by: Geert Uytterhoeven Reviewed-by: Laurent Pinchart Tested-by: Will Deacon Tested-by: Magnus Damn Acked-by: Will Deacon --- drivers/iommu/of_iommu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index 9f44ee8..e6e9bec 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -118,6 +118,7 @@ static bool of_iommu_driver_present(struct device_node *np) ops = iommu_ops_from_fwnode(fwnode); if ((ops && !ops->of_xlate) || + !of_device_is_available(iommu_spec->np) || (!ops && !of_iommu_driver_present(iommu_spec->np))) return NULL;