On Tue, Jan 22, 2019 at 08:13:06PM +0000, Venkatesh Srinivas wrote: > From: Venkatesh Srinivas <venkateshs@xxxxxxxxxx> > > 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 <venkateshs@xxxxxxxxxx> > Reviewed-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > Reviewed-by: Catherine Sullivan <csully@xxxxxxxxxx> > Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> > --- > drivers/uio/uio_pci_generic.c | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) Why is this a "resend" and what changed from the other versions? That should go below the --- line. thanks, greg k-h
