Bluetooth: Fix waiting for clearing of BT_SK_SUSPEND flag

In the case of blocking sockets we should not proceed with sendmsg() if
the socket has the BT_SK_SUSPEND flag set. So far the code was only
ensuring that POLLOUT doesn't get set for non-blocking sockets using
poll() but there was no code in place to ensure that blocking sockets do
the right thing when writing to them.

This patch adds a new bt_sock_wait_ready helper function to sleep in the
sendmsg call if the BT_SK_SUSPEND flag is set, and wake up as soon as it
is unset. It also updates the L2CAP and RFCOMM sendmsg callbacks to take
advantage of this new helper function.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

1 files changed, 6 insertions, 1 deletions

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 30b3721dc6d7..072938dc527d 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -544,7 +544,7 @@ static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
         struct sock *sk = sock->sk;
         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
         struct sk_buff *skb;
-        int sent = 0;
+        int sent;
 
         if (test_bit(RFCOMM_DEFER_SETUP, &d->flags))
                 return -ENOTCONN;
@@ -559,6 +559,10 @@ static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 
         lock_sock(sk);
 
+        sent = bt_sock_wait_ready(sk, msg->msg_flags);
+        if (sent)
+                goto done;
+
         while (len) {
                 size_t size = min_t(size_t, len, d->mtu);
                 int err;
@@ -594,6 +598,7 @@ static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
                 len  -= size;
         }
 
+done:
         release_sock(sk);
 
         return sent;