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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/m68k/mac/iop.c
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@@ -293,7 +293,6 @@
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 /*
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  * Register the interrupt handler for the IOPs.
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- * TODO: might be wrong for non-OSS machines. Anyone?
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  */
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 void __init iop_register_interrupts(void)
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@@ -348,8 +347,8 @@
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 	int chan = msg->channel;
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 	int i,offset;
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-	iop_pr_debug("msg %p iop_num %d channel %d\n", msg, msg->iop_num,
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-	             msg->channel);
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+	iop_pr_debug("iop_num %d chan %d reply %*ph\n",
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+		     msg->iop_num, msg->channel, IOP_MSG_LEN, msg->reply);
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 	offset = IOP_ADDR_RECV_MSG + (msg->channel * IOP_MSG_LEN);
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@@ -373,6 +372,9 @@
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 	volatile struct mac_iop *iop = iop_base[msg->iop_num];
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 	int i,offset;
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+	iop_pr_debug("iop_num %d chan %d message %*ph\n",
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+		     msg->iop_num, msg->channel, IOP_MSG_LEN, msg->message);
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+
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 	offset = IOP_ADDR_SEND_MSG + (msg->channel * IOP_MSG_LEN);
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 	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
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@@ -395,8 +397,6 @@
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 	struct iop_msg *msg;
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 	int i,offset;
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-	iop_pr_debug("iop_num %d chan %d\n", iop_num, chan);
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-
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 	iop_writeb(iop, IOP_ADDR_SEND_STATE + chan, IOP_MSG_IDLE);
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 	if (!(msg = iop_send_queue[iop_num][chan])) return;
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@@ -406,6 +406,9 @@
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 	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
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 		msg->reply[i] = iop_readb(iop, offset);
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 	}
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+	iop_pr_debug("iop_num %d chan %d reply %*ph\n",
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+		     iop_num, chan, IOP_MSG_LEN, msg->reply);
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+
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 	if (msg->handler) (*msg->handler)(msg);
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 	msg->status = IOP_MSGSTATUS_UNUSED;
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 	msg = msg->next;
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@@ -425,8 +428,6 @@
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 	int i,offset;
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 	struct iop_msg *msg;
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-	iop_pr_debug("iop_num %d chan %d\n", iop_num, chan);
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-
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 	msg = iop_get_unused_msg();
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 	msg->iop_num = iop_num;
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 	msg->channel = chan;
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@@ -438,6 +439,8 @@
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 	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
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 		msg->message[i] = iop_readb(iop, offset);
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 	}
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+	iop_pr_debug("iop_num %d chan %d message %*ph\n",
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+		     iop_num, chan, IOP_MSG_LEN, msg->message);
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 	iop_writeb(iop, IOP_ADDR_RECV_STATE + chan, IOP_MSG_RCVD);
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@@ -447,9 +450,7 @@
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 	if (msg->handler) {
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 		(*msg->handler)(msg);
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 	} else {
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-		iop_pr_debug("unclaimed message on iop_num %d chan %d\n",
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-		             iop_num, chan);
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-		iop_pr_debug("%*ph\n", IOP_MSG_LEN, msg->message);
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+		memset(msg->reply, 0, IOP_MSG_LEN);
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 		iop_complete_message(msg);
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 	}
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 }
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@@ -557,36 +558,41 @@
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 	uint iop_num = (uint) dev_id;
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 	volatile struct mac_iop *iop = iop_base[iop_num];
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 	int i,state;
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+	u8 events = iop->status_ctrl & (IOP_INT0 | IOP_INT1);
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-	iop_pr_debug("status %02X\n", iop->status_ctrl);
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+	do {
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+		iop_pr_debug("iop_num %d status %02X\n", iop_num,
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+			     iop->status_ctrl);
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-	/* INT0 indicates a state change on an outgoing message channel */
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-
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-	if (iop->status_ctrl & IOP_INT0) {
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-		iop->status_ctrl = IOP_INT0 | IOP_RUN | IOP_AUTOINC;
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-		iop_pr_debug("new status %02X, send states", iop->status_ctrl);
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-		for (i = 0 ; i < NUM_IOP_CHAN  ; i++) {
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-			state = iop_readb(iop, IOP_ADDR_SEND_STATE + i);
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-			iop_pr_cont(" %02X", state);
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-			if (state == IOP_MSG_COMPLETE) {
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-				iop_handle_send(iop_num, i);
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+		/* INT0 indicates state change on an outgoing message channel */
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+		if (events & IOP_INT0) {
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+			iop->status_ctrl = IOP_INT0 | IOP_RUN | IOP_AUTOINC;
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+			for (i = 0; i < NUM_IOP_CHAN; i++) {
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+				state = iop_readb(iop, IOP_ADDR_SEND_STATE + i);
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+				if (state == IOP_MSG_COMPLETE)
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+					iop_handle_send(iop_num, i);
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+				else if (state != IOP_MSG_IDLE)
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+					iop_pr_debug("chan %d send state %02X\n",
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+						     i, state);
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 			}
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 		}
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-		iop_pr_cont("\n");
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-	}
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-	if (iop->status_ctrl & IOP_INT1) {	/* INT1 for incoming msgs */
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-		iop->status_ctrl = IOP_INT1 | IOP_RUN | IOP_AUTOINC;
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-		iop_pr_debug("new status %02X, recv states", iop->status_ctrl);
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-		for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
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-			state = iop_readb(iop, IOP_ADDR_RECV_STATE + i);
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-			iop_pr_cont(" %02X", state);
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-			if (state == IOP_MSG_NEW) {
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-				iop_handle_recv(iop_num, i);
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+		/* INT1 for incoming messages */
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+		if (events & IOP_INT1) {
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+			iop->status_ctrl = IOP_INT1 | IOP_RUN | IOP_AUTOINC;
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+			for (i = 0; i < NUM_IOP_CHAN; i++) {
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+				state = iop_readb(iop, IOP_ADDR_RECV_STATE + i);
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+				if (state == IOP_MSG_NEW)
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+					iop_handle_recv(iop_num, i);
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+				else if (state != IOP_MSG_IDLE)
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+					iop_pr_debug("chan %d recv state %02X\n",
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+						     i, state);
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 			}
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 		}
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-		iop_pr_cont("\n");
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-	}
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+
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+		events = iop->status_ctrl & (IOP_INT0 | IOP_INT1);
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+	} while (events);
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+
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 	return IRQ_HANDLED;
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 }
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