tun: fasync BKL pushdown

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

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index ce5af2aa8843..4c0c5972a489 100644
--- 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)