tun: fasync BKL pushdown

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index ce5af2aa88432afd6cccf1d488094a86495b3990..4c0c5972a489961ac323318c533cf6a09d388a77 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -782,18 +782,21 @@ static int tun_chr_fasync(int fd, struct file *file, int on)
 
        DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
 
+       lock_kernel();
        if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
-               return ret;
+               goto out;
 
        if (on) {
                ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
                if (ret)
-                       return ret;
+                       goto out;
                tun->flags |= TUN_FASYNC;
        } else
                tun->flags &= ~TUN_FASYNC;
-
-       return 0;
+       ret = 0;
+out:
+       unlock_kernel();
+       return ret;
 }
 
 static int tun_chr_open(struct inode *inode, struct file * file)