1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/ieee1394/ieee1394_transactions.c b/drivers/ieee1394/ieee1394_transactions.c
index 10c3d9f8c038..24021d2f0a75 100644
--- a/drivers/ieee1394/ieee1394_transactions.c
+++ b/drivers/ieee1394/ieee1394_transactions.c
@@ -570,3 +570,32 @@ int hpsb_write(struct hpsb_host *host, nodeid_t node, unsigned int generation,
 
         return retval;
 }
+
+int hpsb_lock(struct hpsb_host *host, nodeid_t node, unsigned int generation,
+              u64 addr, int extcode, quadlet_t *data, quadlet_t arg)
+{
+        struct hpsb_packet *packet;
+        int retval = 0;
+
+        BUG_ON(in_interrupt());
+
+        packet = hpsb_make_lockpacket(host, node, addr, extcode, data, arg);
+        if (!packet)
+                return -ENOMEM;
+
+        packet->generation = generation;
+        retval = hpsb_send_packet_and_wait(packet);
+        if (retval < 0)
+                goto hpsb_lock_fail;
+
+        retval = hpsb_packet_success(packet);
+
+        if (retval == 0)
+                *data = packet->data[0];
+
+hpsb_lock_fail:
+        hpsb_free_tlabel(packet);
+        hpsb_free_packet(packet);
+
+        return retval;
+}