---------------------------------------------------- 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@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx 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.
