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authorJason Wang <jasowang@redhat.com>2012-12-02 17:19:45 +0000
committerDavid S. Miller <davem@davemloft.net>2012-12-03 13:47:57 -0500
commiteb0fb363f920e4d8c70d30b712f9dd433271218c (patch)
tree947aa526a29af66a659f7e995b77167bd09d658f /drivers/net/tun.c
parent092a5fc9636268bc2c0fef4d9b99845699cf19f9 (diff)
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.c11
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");