From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f180.google.com ([209.85.160.180]:34357 "EHLO mail-yk0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751500AbbGXFaB (ORCPT ); Fri, 24 Jul 2015 01:30:01 -0400 From: Kevin Hao To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, Kishon Vijay Abraham I , linux-omap@vger.kernel.org Subject: [PATCH 2/4] PCI: dra7xx: Mark the msi cascade handler IRQF_NO_THREAD Date: Fri, 24 Jul 2015 13:29:34 +0800 Message-Id: <1437715776-2243-3-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-dra7xx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c index 80db09e47800..66aa9286cfc8 100644 --- a/drivers/pci/host/pci-dra7xx.c +++ b/drivers/pci/host/pci-dra7xx.c @@ -284,7 +284,8 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx, } ret = devm_request_irq(&pdev->dev, pp->irq, - dra7xx_pcie_msi_irq_handler, IRQF_SHARED, + dra7xx_pcie_msi_irq_handler, + IRQF_SHARED | IRQF_NO_THREAD, "dra7-pcie-msi", pp); if (ret) { dev_err(&pdev->dev, "failed to request irq\n"); -- 2.1.0