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macvtap: rcu_dereference outside read-lock section 

rcu_dereference occurs in update section. Replacement by
rcu_dereference_protected in order to prevent lockdep
complaint.

Found by Linux Driver Verification project (linuxtesting.org)

Signed-off-by: Denis Efremov <yefremov.denis@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis Efremov 2012-08-11 20:26:31 +00:00 committed by David S. Miller
parent 2359a47671
commit 3a7f8c34fe
1 changed files with 2 additions and 1 deletions
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3
drivers/net/macvtap.c
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@ -94,7 +94,8 @@ static int get_slot(struct macvlan_dev *vlan, struct macvtap_queue *q)
int i;
for (i = 0; i < MAX_MACVTAP_QUEUES; i++) {
if (rcu_dereference(vlan->taps[i]) == q)
if (rcu_dereference_protected(vlan->taps[i],
lockdep_is_held(&macvtap_lock)) == q)
return i;
}