Bluetooth: Wrong style spin lock used
Use spin_lock_bh() as the code is called from softirq in networking subsystem.
This is needed to prevent deadlocks when 6lowpan link is in use.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index ddf3390..91995f8 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -4661,8 +4661,12 @@
skb_shinfo(skb)->frag_list = NULL;
- /* Queue all fragments atomically */
- spin_lock(&queue->lock);
+ /* Queue all fragments atomically. We need to use spin_lock_bh
+ * here because of 6LoWPAN links, as there this function is
+ * called from softirq and using normal spin lock could cause
+ * deadlocks.
+ */
+ spin_lock_bh(&queue->lock);
__skb_queue_tail(queue, skb);
@@ -4679,7 +4683,7 @@
__skb_queue_tail(queue, skb);
} while (list);
- spin_unlock(&queue->lock);
+ spin_unlock_bh(&queue->lock);
}
}