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In addition to making PME non-modular,d7def20400("PCI/PME: Make explicitly non-modular") removed the pcie_pme_driver .remove() method, pcie_pme_remove(). pcie_pme_remove() freed the PME IRQ that was requested in pci_pme_probe(). The fact that we don't free the IRQ afterd7def20400causes the following crash when removing a PCIe port device via /sys: ------------[ cut here ]------------ kernel BUG at drivers/pci/msi.c:370! invalid opcode: 0000 [#1] SMP Modules linked in: CPU: 1 PID: 14509 Comm: sh Tainted: G W 4.8.0-rc1-yh-00012-gd29438d RIP: 0010:[<ffffffff9758bbf5>] free_msi_irqs+0x65/0x190 ... Call Trace: [<ffffffff9758cda4>] pci_disable_msi+0x34/0x40 [<ffffffff97583817>] cleanup_service_irqs+0x27/0x30 [<ffffffff97583e9a>] pcie_port_device_remove+0x2a/0x40 [<ffffffff97584250>] pcie_portdrv_remove+0x40/0x50 [<ffffffff97576d7b>] pci_device_remove+0x4b/0xc0 [<ffffffff9785ebe6>] __device_release_driver+0xb6/0x150 [<ffffffff9785eca5>] device_release_driver+0x25/0x40 [<ffffffff975702e4>] pci_stop_bus_device+0x74/0xa0 [<ffffffff975704ea>] pci_stop_and_remove_bus_device_locked+0x1a/0x30 [<ffffffff97578810>] remove_store+0x50/0x70 [<ffffffff9785a378>] dev_attr_store+0x18/0x30 [<ffffffff97260b64>] sysfs_kf_write+0x44/0x60 [<ffffffff9725feae>] kernfs_fop_write+0x10e/0x190 [<ffffffff971e13f8>] __vfs_write+0x28/0x110 [<ffffffff970b0fa4>] ? percpu_down_read+0x44/0x80 [<ffffffff971e53a7>] ? __sb_start_write+0xa7/0xe0 [<ffffffff971e53a7>] ? __sb_start_write+0xa7/0xe0 [<ffffffff971e1f04>] vfs_write+0xc4/0x180 [<ffffffff971e3089>] SyS_write+0x49/0xa0 [<ffffffff97001a46>] do_syscall_64+0xa6/0x1b0 [<ffffffff9819201e>] entry_SYSCALL64_slow_path+0x25/0x25 ... RIP [<ffffffff9758bbf5>] free_msi_irqs+0x65/0x190 RSP <ffff89ad3085bc48> ---[ end trace f4505e1dac5b95d3 ]--- Segmentation fault Restore pcie_pme_remove(). [bhelgaas: changelog] Fixes:d7def20400("PCI/PME: Make explicitly non-modular") Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> CC: stable@vger.kernel.org # v4.9+
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.