[Bluetooth] Signal user-space for HIDP and BNEP socket errors

When using the HIDP or BNEP kernel support, the user-space needs to
know if the connection has been terminated for some reasons. Wake up
the application if that happens. Otherwise kernel and user-space are
no longer on the same page and weird behaviors can happen.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index f85d94643aaf..24e91eb7f649 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -507,6 +507,11 @@ static int bnep_session(void *arg)
         /* Delete network device */
         unregister_netdev(dev);
 
+        /* Wakeup user-space polling for socket errors */
+        s->sock->sk->sk_err = EUNATCH;
+
+        wake_up_interruptible(s->sock->sk->sk_sleep);
+
         /* Release the socket */
         fput(s->sock->file);