From patchwork Sat May 27 13:47:40 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sricharan Ramabadhran X-Patchwork-Id: 9751905 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 3C1B260393 for ; Sat, 27 May 2017 13:50:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 340C728425 for ; Sat, 27 May 2017 13:50:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 285E128475; Sat, 27 May 2017 13:50:11 +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 C7A1128470 for ; Sat, 27 May 2017 13:50:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757072AbdE0Ns2 (ORCPT ); Sat, 27 May 2017 09:48:28 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:38762 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757037AbdE0NsY (ORCPT ); Sat, 27 May 2017 09:48:24 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id CC5B9613C0; 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=1495892903; bh=1kd7+jzctCEUozPtJ+dE3w/8R7sqX8xMo+sMePvX+Rk=; h=From:To:Cc:Subject:Date:From; b=DkCTQO5d4KQspzirZzorsQC5bc4ovO8+GL/4zDtcNie6rvytPF5a9oznhMcNOVmMv 1HvgCLuOlMLnubajxOaSPzgtm5IUyd/dTLQflwqDJ4s/WNTE753MwGY3PthdgHgM3e 25lR0lznVxQTfbKT1UPaA6lw4Bi/eLAhQ5kQueFw= 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 2D111612E1; Sat, 27 May 2017 13:48:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1495892892; bh=1kd7+jzctCEUozPtJ+dE3w/8R7sqX8xMo+sMePvX+Rk=; h=From:To:Cc:Subject:Date:From; b=HNcyEHmXV8q7cMhO+JT6ZJ3HHyWKh0UhpSyNMux//mH0JtyTVM4gJ2s2PMk6Fwsnb pLInrYtERzeRmy66CnMT/mbXAh5PGPvAuyRfc8lIciN/95QlaDa/kjrP17BjoRDzba 9/X0TPsicXFLDlX6wJ4wYG/pomHRNgwnTvZA7MJY= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 2D111612E1 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 1/6] iommu: of: Fix check for returning EPROBE_DEFER Date: Sat, 27 May 2017 19:17:40 +0530 Message-Id: <1495892865-9506-1-git-send-email-sricharan@codeaurora.org> X-Mailer: git-send-email 1.9.1 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 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") Reported-by: Geert Uytterhoeven Reviewed-by: Laurent Pinchart Tested-by: Will Deacon Tested-by: Magnus Damn Acked-by: Will Deacon Signed-off-by: Sricharan R --- 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;