bt: Add call to bt_poll to kick start message state machine

The bt interface relies on a fairly simple state machine to send
messages to the bmc. Messages are added to a queue for sending and
something calls the state machine to start sending messages, usually
via opal_poll_events. However under some circumstances this doesn't
happen so we need to crank the state machine to start start sending
messages.

This patch adds a call to bt_poll to make sure we start sending a
message which should ensure the bmc generates an irq once the message
is sent to continue processing.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 24 insertions, 22 deletions

diff --git a/hw/bt.c b/hw/bt.c
index 1fe25dc..2b16570 100644
--- a/hw/bt.c
+++ b/hw/bt.c
@@ -129,28 +129,6 @@ static void bt_msg_del(struct bt_msg *bt_msg)
 		      IPMI_TIMEOUT_ERR, &bt_msg->ipmi_msg);
 }
 
-static int bt_add_ipmi_msg(struct ipmi_msg *ipmi_msg)
-{
-	struct bt_msg *bt_msg = container_of(ipmi_msg, struct bt_msg, ipmi_msg);
-
-	lock(&bt.lock);
-	bt_msg->tb = mftb();
-	bt_msg->seq = ipmi_seq++;
-	list_add_tail(&bt.msgq, &bt_msg->link);
-	bt.queue_len++;
-	if (bt.queue_len > BT_MAX_QUEUE_LEN) {
-		/* Maximum ueue lenght exceeded - remove the oldest message
-		   from the queue. */
-		prerror("BT: Maximum queue length exceeded\n");
-		bt_msg = list_tail(&bt.msgq, struct bt_msg, link);
-		assert(bt_msg);
-		bt_msg_del(bt_msg);
-	}
-	unlock(&bt.lock);
-
-	return 0;
-}
-
 static void bt_reset_interface(void)
 {
 	bt_outb(BT_INTMASK_BMC_HWRST, BT_INTMASK);
@@ -379,6 +357,30 @@ static void bt_poll(void *data __unused)
 	while(!ret);
 }
 
+static int bt_add_ipmi_msg(struct ipmi_msg *ipmi_msg)
+{
+	struct bt_msg *bt_msg = container_of(ipmi_msg, struct bt_msg, ipmi_msg);
+
+	lock(&bt.lock);
+	bt_msg->tb = mftb();
+	bt_msg->seq = ipmi_seq++;
+	list_add_tail(&bt.msgq, &bt_msg->link);
+	bt.queue_len++;
+	if (bt.queue_len > BT_MAX_QUEUE_LEN) {
+		/* Maximum ueue lenght exceeded - remove the oldest message
+		   from the queue. */
+		prerror("BT: Maximum queue length exceeded\n");
+		bt_msg = list_tail(&bt.msgq, struct bt_msg, link);
+		assert(bt_msg);
+		bt_msg_del(bt_msg);
+	}
+	unlock(&bt.lock);
+
+	bt_poll(NULL);
+
+	return 0;
+}
+
 void bt_irq(void)
 {
 	uint8_t ireg = bt_inb(BT_INTMASK);