From: Alex Williamson alex.williamson@redhat.com Sent: Tuesday, April 15, 2025 5:18 AM
This reverts commit 479380efe1625e251008d24b2810283db60d6fcd.
The reset_method attribute on a PCI device is only intended to manage the availability of function scoped resets for a device. It was never intended to restrict resets targeting the bus or slot.
In introducing a restriction that each device must support function level reset by testing pci_reset_supported(), we essentially create a catch-22, that a device must have a function scope reset in order to support bus/slot reset, when we use bus/slot reset to effect a reset of a device that does not support a function scoped reset, especially multi-function devices.
This breaks the majority of uses cases where vfio-pci uses bus/slot resets to manage multifunction devices that do not support function scoped resets.
Fixes: 479380efe162 ("PCI: Avoid reset when disabled via sysfs") Reported-by: Cal Peake cp@absolutedigital.net Link: https://lore.kernel.org/all/808e1111-27b7-f35b-6d5c- 5b275e73677b@absolutedigital.net Cc: stable@vger.kernel.org Signed-off-by: Alex Williamson alex.williamson@redhat.com
Reviewed-by: Kevin Tian kevin.tian@intel.com