tun: move the call to tun_set_real_num_queues

Call tun_set_real_num_queues() after the increment of tun->numqueues
since the former depends on it. Otherwise, the number of queues is not
correctly accounted for, which results to warnings similar to:
"vnet0 selects TX queue 11, but real number of TX queues is 11".

Fixes: 0b7959b62573 ("tun: publish tfile after it's fully initialized")
Reported-and-tested-by: George Amanakis <gamanakis@gmail.com>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 18656c4094b3..fed298c0cb39 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -866,8 +866,6 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
         if (rtnl_dereference(tun->xdp_prog))
                 sock_set_flag(&tfile->sk, SOCK_XDP);
 
-        tun_set_real_num_queues(tun);
-
         /* device is allowed to go away first, so no need to hold extra
          * refcnt.
          */
@@ -879,6 +877,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
         rcu_assign_pointer(tfile->tun, tun);
         rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile);
         tun->numqueues++;
+        tun_set_real_num_queues(tun);
 out:
         return err;
 }