tree f4b18244c9daeea9a04b68a0fc050960e5c42507
parent 99f34b38cdc8f75a4b9adb5a617b118253b3efe1
author Eric W. Biederman <ebiederm@xmission.com> 1319084799 +0000
committer David S. Miller <davem@davemloft.net> 1319179987 -0400

macvtap: Fix macvtap_open races in the zero copy enable code.

To see if it is appropriate to enable the macvtap zero copy feature
don't test the lowerdev network device flags.   Instead test the
macvtap network device flags which are a direct copy of the lowerdev
flags.  This is important because nothing holds a reference to lowerdev
and on a very bad day we lowerdev could be a pointer to stale memory.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>