tree 3643e9d0b552db754ec8c679c97a9393ce5d1c52
parent a9b6e5567326bb9d90f1f551878a068b9bfb971b
author Eric Auger <eric.auger@redhat.com> 1550247366 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1580289856 +0100

vfio_pci: Enable memory accesses before calling pci_map_rom

[ Upstream commit 0cfd027be1d6def4a462cdc180c055143af24069 ]

pci_map_rom/pci_get_rom_size() performs memory access in the ROM.
In case the Memory Space accesses were disabled, readw() is likely
to trigger a synchronous external abort on some platforms.

In case memory accesses were disabled, re-enable them before the
call and disable them back again just after.

Fixes: 89e1f7d4c66d ("vfio: Add PCI device driver")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>