Description
In the Linux kernel, the following vulnerability has been resolved: PCI: pnv_php: Fix surprise plug detection and recovery The existing PowerNV hotplug code did not handle surprise plug events correctly, leading to a complete failure of the hotplug system after device removal and a required reboot to detect new devices. This comes down to two issues: 1) When a device is surprise removed, often the bridge upstream port will cause a PE freeze on the PHB. If this freeze is not cleared, the MSI interrupts from the bridge hotplug notification logic will not be received by the kernel, stalling all plug events on all slots associated with the PE. 2) When a device is removed from a slot, regardless of surprise or programmatic removal, the associated PHB/PE ls left frozen. If this freeze is not cleared via a fundamental reset, skiboot is unable to clear the freeze and cannot retrain / rescan the slot. This also requires a reboot to clear the freeze and redetect the device in the slot. Issue the appropriate unfreeze and rescan commands on hotplug events, and don't oops on hotplug if pci_bus_to_OF_node() returns NULL. [bhelgaas: tidy comments]
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6e7b5f922901585b8f11e0d6cda12bda5c59fc8a
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2ec8ec57bb8ebde3e2a015eff80e5d66e6634fe3
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 473999ba937eac9776be791deed7c84a21d7880b
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6e7b24c71e530a6c1d656e73d8a30ee081656844
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 48c6935a34981bb56f35be0774ec1f30c6e386f8
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 1d2f63680c5719a5da92639e981c6c9a87fcee08
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 78d20b8c13075eae3d884c21db7a09a6bbdda5b2
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a2a2a6fc2469524caa713036297c542746d148dc
5.10.241
5.15.190
6.1.148
6.6.102
6.12.42
6.15.10
6.16.1
6.17
References
git.kernel.org/...c/6e7b5f922901585b8f11e0d6cda12bda5c59fc8a
git.kernel.org/...c/2ec8ec57bb8ebde3e2a015eff80e5d66e6634fe3
git.kernel.org/...c/473999ba937eac9776be791deed7c84a21d7880b
git.kernel.org/...c/6e7b24c71e530a6c1d656e73d8a30ee081656844
git.kernel.org/...c/48c6935a34981bb56f35be0774ec1f30c6e386f8
git.kernel.org/...c/1d2f63680c5719a5da92639e981c6c9a87fcee08
git.kernel.org/...c/78d20b8c13075eae3d884c21db7a09a6bbdda5b2
git.kernel.org/...c/a2a2a6fc2469524caa713036297c542746d148dc
