From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 AD172C2D0DB for ; Fri, 24 Jan 2020 09:58:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 81B9A20709 for ; Fri, 24 Jan 2020 09:58:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579859914; bh=YZQj15HykUfkx12S9MAongzeegBHADwge2FK/tjmt2k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=drDssd4h2LYiIZvHroUEcI/WmoN0PJaSjSr+qm8oIX47nyn8rxN0RkkElTYzP75CP hpvTOTzXinCILj9fDhuoi4XJTCU0PGaHH5IahyLTeGr6YBEzex/uA0GaslyQABtdzh Y/EKm3MMm1VVSqvYkWpFRZvxI9h8LUf+4tJaX4ng= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731051AbgAXJ6e (ORCPT ); Fri, 24 Jan 2020 04:58:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:34032 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725821AbgAXJ6d (ORCPT ); Fri, 24 Jan 2020 04:58:33 -0500 Received: from localhost (unknown [145.15.244.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 257B620709; Fri, 24 Jan 2020 09:58:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579859912; bh=YZQj15HykUfkx12S9MAongzeegBHADwge2FK/tjmt2k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vo7vKxIAygQ1hHeYfwZGeNE3zMzeP/qZP96oVRzfPDLJ7bkQralL6wZng99HkU/ws uzBt67TecdevcQEwUmW7T2LyrRhrKQeVM/Sc4u1FduNHPTNU1Tj6yevHC/dthAC4yS yCpGDNDllqhoLDfuwjnzZ/kD+DOggfQA9qzv/iCU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jon Hunter , Vinod Koul , Sasha Levin Subject: [PATCH 4.14 212/343] dmaengine: tegra210-adma: Fix crash during probe Date: Fri, 24 Jan 2020 10:30:30 +0100 Message-Id: <20200124092947.960310264@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124092919.490687572@linuxfoundation.org> References: <20200124092919.490687572@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jon Hunter [ Upstream commit b53611fb1ce9b1786bd18205473e0c1d6bfa8934 ] Commit f33e7bb3eb92 ("dmaengine: tegra210-adma: restore channel status") added support to save and restore the DMA channel registers when runtime suspending the ADMA. This change is causing the kernel to crash when probing the ADMA, if the device is probed deferred when looking up the channel interrupts. The crash occurs because not all of the channel base addresses have been setup at this point and in the clean-up path of the probe, pm_runtime_suspend() is called invoking its callback which expects all the channel base addresses to be initialised. Although this could be fixed by simply checking for a NULL address, on further review of the driver it seems more appropriate that we only call pm_runtime_get_sync() after all the channel interrupts and base addresses have been configured. Therefore, fix this crash by moving the calls to pm_runtime_enable(), pm_runtime_get_sync() and tegra_adma_init() after the DMA channels have been initialised. Fixes: f33e7bb3eb92 ("dmaengine: tegra210-adma: restore channel status") Signed-off-by: Jon Hunter Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/tegra210-adma.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c index ac2a6b800db3e..4f4733d831a1a 100644 --- a/drivers/dma/tegra210-adma.c +++ b/drivers/dma/tegra210-adma.c @@ -744,16 +744,6 @@ static int tegra_adma_probe(struct platform_device *pdev) return PTR_ERR(tdma->ahub_clk); } - pm_runtime_enable(&pdev->dev); - - ret = pm_runtime_get_sync(&pdev->dev); - if (ret < 0) - goto rpm_disable; - - ret = tegra_adma_init(tdma); - if (ret) - goto rpm_put; - INIT_LIST_HEAD(&tdma->dma_dev.channels); for (i = 0; i < tdma->nr_channels; i++) { struct tegra_adma_chan *tdc = &tdma->channels[i]; @@ -771,6 +761,16 @@ static int tegra_adma_probe(struct platform_device *pdev) tdc->tdma = tdma; } + pm_runtime_enable(&pdev->dev); + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) + goto rpm_disable; + + ret = tegra_adma_init(tdma); + if (ret) + goto rpm_put; + dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask); dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask); dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask); @@ -812,13 +812,13 @@ static int tegra_adma_probe(struct platform_device *pdev) dma_remove: dma_async_device_unregister(&tdma->dma_dev); -irq_dispose: - while (--i >= 0) - irq_dispose_mapping(tdma->channels[i].irq); rpm_put: pm_runtime_put_sync(&pdev->dev); rpm_disable: pm_runtime_disable(&pdev->dev); +irq_dispose: + while (--i >= 0) + irq_dispose_mapping(tdma->channels[i].irq); return ret; } -- 2.20.1