uio/uio_pci_generic: Disable bus-mastering on release
Userspace code using uio_pci_generic may enable bus-mastering by
directly manipulating a PCI device's command register. If a userspace
program enables bus-mastering but exits/crashes uncleanly, bus-
mastering will still be enabled and stale DMA addresses may be
programmed and live in the device.
Disable bus-mastering unconditionally on last close of a UIO PCI fd
to avoid this. If the device did not have bus-mastering enabled,
pci_clear_master() is a no-op.
Signed-off-by: Venkatesh Srinivas <[email protected]>
Reviewed-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Catherine Sullivan <[email protected]>
Acked-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
1 file changed
