tree 5121604d0025974356f09bb0027e018f1be05e03
parent c64019302bbb0b445484d870e674ab34a19a18a1
author Alex Williamson <alex.williamson@redhat.com> 1370904057 -0600
committer Alex Williamson <alex.williamson@redhat.com> 1374705401 -0600

vfio-pci: Avoid deadlock on remove

If an attempt is made to unbind a device from vfio-pci while that
device is in use, the request is blocked until the device becomes
unused.  Unfortunately, that unbind path still grabs the device_lock,
which certain things like __pci_reset_function() also want to take.
This means we need to try to acquire the locks ourselves and use the
pre-locked version, __pci_reset_function_locked().

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>