From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753366AbbCaTtj (ORCPT ); Tue, 31 Mar 2015 15:49:39 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:39110 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753160AbbCaTtU (ORCPT ); Tue, 31 Mar 2015 15:49:20 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Jisheng Zhang , Ulf Hansson , Kamal Mostafa Subject: [PATCH 3.13.y-ckt 050/143] mmc: sdhci-pxav3: fix race between runtime pm and irq Date: Tue, 31 Mar 2015 12:46:55 -0700 Message-Id: <1427831308-1854-51-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1427831308-1854-1-git-send-email-kamal@canonical.com> References: <1427831308-1854-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.13 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.13.11-ckt18 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Jisheng Zhang commit 3bb10f60933e84abfe2be69f60b3486f9b96348b upstream. This patch is to fix a race condition that may cause an unhandled irq, which results in big sdhci interrupt numbers and endless "mmc1: got irq while runtime suspended" msgs before v3.15. Consider following scenario: CPU0 CPU1 sdhci_pxav3_runtime_suspend() spin_lock_irqsave(&host->lock, flags); sdhci_irq() spining on the &host->lock host->runtime_suspended = true; spin_unlock_irqrestore(&host->lock, flags); get the &host->lock runtime_suspended is true now return IRQ_NONE; Fix this race by using the core sdhci.c supplied sdhci_runtime_suspend_host() in runtime suspend hook which will disable card interrupts. We also use the sdhci_runtime_resume_host() in the runtime resume hook accordingly. Signed-off-by: Jisheng Zhang Signed-off-by: Ulf Hansson [ kamal: backport to 3.13-stable: context ] Signed-off-by: Kamal Mostafa --- drivers/mmc/host/sdhci-pxav3.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c index 68c772f..bb906ab 100644 --- a/drivers/mmc/host/sdhci-pxav3.c +++ b/drivers/mmc/host/sdhci-pxav3.c @@ -379,11 +379,11 @@ static int sdhci_pxav3_runtime_suspend(struct device *dev) { struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); - unsigned long flags; + int ret; - spin_lock_irqsave(&host->lock, flags); - host->runtime_suspended = true; - spin_unlock_irqrestore(&host->lock, flags); + ret = sdhci_runtime_suspend_host(host); + if (ret) + return ret; clk_disable_unprepare(pltfm_host->clk); @@ -394,15 +394,10 @@ static int sdhci_pxav3_runtime_resume(struct device *dev) { struct sdhci_host *host = dev_get_drvdata(dev); struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); - unsigned long flags; clk_prepare_enable(pltfm_host->clk); - spin_lock_irqsave(&host->lock, flags); - host->runtime_suspended = false; - spin_unlock_irqrestore(&host->lock, flags); - - return 0; + return sdhci_runtime_resume_host(host); } #endif -- 1.9.1