1 files changed, 7 insertions, 0 deletions

diff --git a/net/socket.c b/net/socket.c
index 35dd7371752a..0f75746ab06e 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1030,6 +1030,13 @@ static int sock_fasync(int fd, struct file *filp, int on)
 
         lock_sock(sk);
 
+        spin_lock(&filp->f_lock);
+        if (on)
+                filp->f_flags |= FASYNC;
+        else
+                filp->f_flags &= ~FASYNC;
+        spin_unlock(&filp->f_lock);
+
         prev = &(sock->fasync_list);
 
         for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev)