linux-kernel - [PATCH] PCI: designware: add a check of msi

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Date:   Thu, 14 Dec 2017 10:21:22 +0800
From:   <cao.zou@...driver.com>
To:     <jingoohan1@...il.com>
CC:     <Joao.Pinto@...opsys.com>, <bhelgaas@...gle.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] PCI: designware: add a check of msi_desc in irqchip

----------------------------------------------------
Summary:  PCI: designware: add a check of msi_desc in irqchip
Reviewers: paul
----------------------------------------------------

Upstream Project Name: linux-kernel
Upstream Project URL: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
Applies to: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
Brief Description: Incorrect mask bits leave device stalled after flood ping.
Will Submit to: shan lai <jiangshanlai@...il.com>, linux-kernel@...r.kernel.org
Origin of patch: Discovered by me while working on common_pc
IP content: None, trivial obvious fix.

Comments:
---------

this issue is reproduced in imx7d-sdb when running the kdump with pluging Intel 1030 PCI,
the root caused is machine_kexec_mask_interrupts will force to mask every exist irq_desc
include msi irq.

background:
msi irq mask is based on msi_desc, it is bound only in msi irq setup by pci driver.
for others not request msi irqs by pci driver, its msi_desc is null, so crash in
machine_kexec_mask_interrupts.