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| author | Venkatesh Srinivas <venkateshs@google.com> | 2019-01-23 14:27:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-31 18:22:51 +0300 |
| commit | 865a11f987ab5f03089b2728420b61a2a1f7051a (patch) | |
| tree | 297392fb063a48e7b8faa6db2759453703dc6030 /drivers/fpga/altera-ps-spi.c | |
| parent | e5bae74338b37fb88d33d7c18acb694670c24b09 (diff) | |
| download | linux-865a11f987ab5f03089b2728420b61a2a1f7051a.tar.xz | |
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 <venkateshs@google.com>
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga/altera-ps-spi.c')
0 files changed, 0 insertions, 0 deletions