diff options
| author |   Jason Wang <jasowang@redhat.com> | 2012-12-02 17:19:45 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-12-03 13:47:57 -0500 |
| commit | eb0fb363f920e4d8c70d30b712f9dd433271218c (patch) | |
| tree | 947aa526a29af66a659f7e995b77167bd09d658f /drivers/net/tun.c | |
| parent | bnx2x: recognize fan failure (diff) | |
| download | linux-dev-eb0fb363f920e4d8c70d30b712f9dd433271218c.tar.xz linux-dev-eb0fb363f920e4d8c70d30b712f9dd433271218c.zip | |
tuntap: attach queue 0 before registering netdevice
We attach queue 0 after registering netdevice currently. This leads to call
netif_set_real_num_{tx|rx}_queues() after registering the netdevice. Since we
allow tun/tap has a maximum of 1024 queues, this may lead a huge number of
uevents to be injected to userspace since we create 2048 kobjects and then
remove 2046. Solve this problem by attaching queue 0 and set the real number of
queues before registering netdevice.
Reported-by: Jiri Slaby <jslaby@suse.cz>
Tested-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
| -rw-r--r-- | drivers/net/tun.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 607a3a5981c6..71f6874d8048 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -493,9 +493,6 @@ static int tun_attach(struct tun_struct *tun, struct file *file) tun_set_real_num_queues(tun); - if (tun->numqueues == 1) - netif_carrier_on(tun->dev); - /* device is allowed to go away first, so no need to hold extra * refcnt. */ @@ -1612,6 +1609,10 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) TUN_USER_FEATURES; dev->features = dev->hw_features; + err = tun_attach(tun, file); + if (err < 0) + goto err_free_dev; + err = register_netdevice(tun->dev); if (err < 0) goto err_free_dev; @@ -1621,9 +1622,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) device_create_file(&tun->dev->dev, &dev_attr_group)) pr_err("Failed to create tun sysfs files\n"); - err = tun_attach(tun, file); - if (err < 0) - goto err_free_dev; + netif_carrier_on(tun->dev); } tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |