commit 5d6dee80a1 upstream.
At the point where the kvm-vfio pseudo device wants to release its
vfio group reference, we can't always acquire a new reference to make
that happen. The group can be in a state where we wouldn't allow a
new reference to be added. This new helper function allows a caller
to match a file to a group to facilitate this. Given a file and
group, report if they match. Thus the caller needs to already have a
group reference to match to the file. This allows the deletion of a
group without acquiring a new reference.
Signed-off-by: Alex Williamson <firstname.lastname@example.org>
Reviewed-by: Eric Auger <email@example.com>
Reviewed-by: Paolo Bonzini <firstname.lastname@example.org>
Tested-by: Eric Auger <email@example.com>
Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>