Bluetooth: ISO: Don't initiate CIS connections if there are no buffers

[ Upstream commit d79c7d01f1c8bcf9a48337c8960d618fbe31fc0c ]

If the controller has no buffers left return -ENOBUFF to indicate that
iso_cnt might be out of sync.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/bluetooth/iso.c b/net/bluetooth/iso.c
index 6e2923b301505764f9be749173b7aeb2310408ac..3b2a4a9d79d615f3fc8fd0b8a61a8957970c9905 100644 (file)
--- a/net/bluetooth/iso.c
+++ b/net/bluetooth/iso.c
@@ -460,6 +460,13 @@ static int iso_connect_cis(struct sock *sk)
                goto unlock;
        }
 
+       /* Check if there are available buffers for output/TX. */
+       if (iso_pi(sk)->qos.ucast.out.sdu && !hci_iso_count(hdev) &&
+           (hdev->iso_pkts && !hdev->iso_cnt)) {
+               err = -ENOBUFS;
+               goto unlock;
+       }
+
        /* Just bind if DEFER_SETUP has been set */
        if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
                hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,