Revert "PCI: Avoid reset when disabled via sysfs"

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 <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]
Reported-by: Athul Krishna <[email protected]>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220010
Signed-off-by: Alex Williamson <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Cc: [email protected]
Link: https://patch.msgid.link/[email protected]

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