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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>
This commit is contained in:
Jason Wang 2012-12-02 17:19:45 +00:00 committed by David S. Miller
parent 092a5fc963
commit eb0fb363f9
1 changed files with 5 additions and 6 deletions
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11
drivers/net/tun.c
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@ -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");