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| author | Jason Wang <jasowang@redhat.com> | 2013-05-28 18:32:11 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-29 00:21:32 -0700 |
| commit | 8e6d91ae0917bf934ed86411148f79d904728d51 (patch) | |
| tree | ccffbffdcb079b492082a8e8f0b73b446b238d8c /net/ipv4 | |
| parent | 456db6a4d495f40777da6f1f32f62f13026f52db (diff) | |
| download | linux-stable-8e6d91ae0917bf934ed86411148f79d904728d51.tar.gz linux-stable-8e6d91ae0917bf934ed86411148f79d904728d51.tar.bz2 linux-stable-8e6d91ae0917bf934ed86411148f79d904728d51.zip | |
tuntap: forbid changing mq flag for persistent device
We currently allow changing the mq flag (IFF_MULTI_QUEUE) for a persistent
device. This will result a mismatch between the number the queues in netdev and
tuntap. This is because we only allocate a 1q netdevice when IFF_MULTI_QUEUE was
not specified, so when we set the IFF_MULTI_QUEUE and try to attach more queues
later, netif_set_real_num_tx_queues() may fail which result a single queue
netdevice with multiple sockets attached.
Solve this by disallowing changing the mq flag for persistent device.
Bug was introduced by commit edfb6a148ce62e5e19354a1dcd9a34e00815c2a1
(tuntap: reduce memory using of queues).
Reported-by: Sriram Narasimhan <sriram.narasimhan@hp.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
0 files changed, 0 insertions, 0 deletions