From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yk0-f179.google.com ([209.85.160.179]:34414 "EHLO mail-yk0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751500AbbGXFaI (ORCPT ); Fri, 24 Jul 2015 01:30:08 -0400 Received: by ykax123 with SMTP id x123so11808244yka.1 for ; Thu, 23 Jul 2015 22:30:07 -0700 (PDT) From: Kevin Hao To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, Pratyush Anand Subject: [PATCH 4/4] PCI: spear: Mark the msi cascade handler IRQF_NO_THREAD Date: Fri, 24 Jul 2015 13:29:36 +0800 Message-Id: <1437715776-2243-5-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/pcie-spear13xx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c index c49fbdc0f6e4..338788b28631 100644 --- a/drivers/pci/host/pcie-spear13xx.c +++ b/drivers/pci/host/pcie-spear13xx.c @@ -280,7 +280,8 @@ static int spear13xx_add_pcie_port(struct pcie_port *pp, return -ENODEV; } ret = devm_request_irq(dev, pp->irq, spear13xx_pcie_irq_handler, - IRQF_SHARED, "spear1340-pcie", pp); + IRQF_SHARED | IRQF_NO_THREAD, + "spear1340-pcie", pp); if (ret) { dev_err(dev, "failed to request irq %d\n", pp->irq); return ret; -- 2.1.0