From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f182.google.com ([209.85.160.182]:35821 "EHLO mail-yk0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751500AbbGXFaF (ORCPT ); Fri, 24 Jul 2015 01:30:05 -0400 From: Kevin Hao To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, Jingoo Han , Kukjin Kim , Krzysztof Kozlowski , linux-samsung-soc@vger.kernel.org Subject: [PATCH 3/4] PCI: exynos: Mark the msi cascade handler IRQF_NO_THREAD Date: Fri, 24 Jul 2015 13:29:35 +0800 Message-Id: <1437715776-2243-4-git-send-email-haokexin@gmail.com> In-Reply-To: <1437715776-2243-1-git-send-email-haokexin@gmail.com> References: <1437715776-2243-1-git-send-email-haokexin@gmail.com> Sender: linux-pci-owner@vger.kernel.org List-ID: The cascade handler must run in hard interrupt context, otherwise it will cause dead lock if we force threading of all the interrupt handlers via kernel command parameter "threadirqs". Signed-off-by: Kevin Hao --- drivers/pci/host/pci-exynos.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c index f9f468d9a819..7b6be7791d33 100644 --- a/drivers/pci/host/pci-exynos.c +++ b/drivers/pci/host/pci-exynos.c @@ -523,7 +523,8 @@ static int __init exynos_add_pcie_port(struct pcie_port *pp, ret = devm_request_irq(&pdev->dev, pp->msi_irq, exynos_pcie_msi_irq_handler, - IRQF_SHARED, "exynos-pcie", pp); + IRQF_SHARED | IRQF_NO_THREAD, + "exynos-pcie", pp); if (ret) { dev_err(&pdev->dev, "failed to request msi irq\n"); return ret; -- 2.1.0