RE: [PATCH] Revert "PCI: Avoid reset when disabled via sysfs"

[Tian, Kevin]

> From: Alex Williamson <alex.williamson@xxxxxxxxxx>
> 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@xxxxxxxxxxxxxxxxxxx>
> Link: https://lore.kernel.org/all/808e1111-27b7-f35b-6d5c-
> 5b275e73677b@xxxxxxxxxxxxxxxxxxx
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>