s390/qdio: split qdio_inspect_queue()

The callers know what type of queue they want to inspect. Introduce
type-specific variants to inspect an {Input,Output} queue, so that we
can avoid one function parameter and some conditional branches in the
hot paths.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/include/asm/qdio.h

@@ -352,9 +352,10 @@ extern int do_QDIO(struct ccw_device *cdev, unsigned int callflags, int q_nr,
 		   unsigned int bufnr, unsigned int count, struct qaob *aob);
 extern int qdio_start_irq(struct ccw_device *cdev);
 extern int qdio_stop_irq(struct ccw_device *cdev);
-extern int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr,
-			      bool is_input, unsigned int *bufnr,
-			      unsigned int *error);
+extern int qdio_inspect_input_queue(struct ccw_device *cdev, unsigned int nr,
+				    unsigned int *bufnr, unsigned int *error);
+extern int qdio_inspect_output_queue(struct ccw_device *cdev, unsigned int nr,
+				     unsigned int *bufnr, unsigned int *error);
 extern int qdio_shutdown(struct ccw_device *, int);
 extern int qdio_free(struct ccw_device *);
 extern int qdio_get_ssqd_desc(struct ccw_device *, struct qdio_ssqd_desc *);

drivers/s390/cio/qdio_main.c

@@ -500,6 +500,31 @@ static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start,
 	}
 }
 
+int qdio_inspect_input_queue(struct ccw_device *cdev, unsigned int nr,
+			     unsigned int *bufnr, unsigned int *error)
+{
+	struct qdio_irq *irq = cdev->private->qdio_data;
+	unsigned int start;
+	struct qdio_q *q;
+	int count;
+
+	if (!irq)
+		return -ENODEV;
+
+	q = irq->input_qs[nr];
+	start = q->first_to_check;
+	*error = 0;
+
+	count = get_inbound_buffer_frontier(q, start, error);
+	if (count == 0)
+		return 0;
+
+	*bufnr = start;
+	q->first_to_check = add_buf(start, count);
+	return count;
+}
+EXPORT_SYMBOL_GPL(qdio_inspect_input_queue);
+
 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 {
 	unsigned char state = 0;
@@ -579,6 +604,31 @@ static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start,
 	}
 }
 
+int qdio_inspect_output_queue(struct ccw_device *cdev, unsigned int nr,
+			      unsigned int *bufnr, unsigned int *error)
+{
+	struct qdio_irq *irq = cdev->private->qdio_data;
+	unsigned int start;
+	struct qdio_q *q;
+	int count;
+
+	if (!irq)
+		return -ENODEV;
+
+	q = irq->output_qs[nr];
+	start = q->first_to_check;
+	*error = 0;
+
+	count = get_outbound_buffer_frontier(q, start, error);
+	if (count == 0)
+		return 0;
+
+	*bufnr = start;
+	q->first_to_check = add_buf(start, count);
+	return count;
+}
+EXPORT_SYMBOL_GPL(qdio_inspect_output_queue);
+
 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 				unsigned long aob)
 {
@@ -1284,40 +1334,6 @@ rescan:
 }
 EXPORT_SYMBOL(qdio_start_irq);
 
-static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
-				unsigned int *error)
-{
-	unsigned int start = q->first_to_check;
-	int count;
-
-	*error = 0;
-	count = q->is_input_q ? get_inbound_buffer_frontier(q, start, error) :
-				get_outbound_buffer_frontier(q, start, error);
-	if (count == 0)
-		return 0;
-
-	*bufnr = start;
-
-	/* for the next time */
-	q->first_to_check = add_buf(start, count);
-
-	return count;
-}
-
-int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
-		       unsigned int *bufnr, unsigned int *error)
-{
-	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
-	struct qdio_q *q;
-
-	if (!irq_ptr)
-		return -ENODEV;
-	q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
-
-	return __qdio_inspect_queue(q, bufnr, error);
-}
-EXPORT_SYMBOL_GPL(qdio_inspect_queue);
-
 /**
  * qdio_stop_irq - disable interrupt processing for the device
  * @cdev: associated ccw_device for the qdio subchannel

drivers/s390/net/qeth_core_main.c

@@ -5850,10 +5850,10 @@ static unsigned int qeth_rx_poll(struct qeth_card *card, int budget)
 		/* Fetch completed RX buffers: */
 		if (!card->rx.b_count) {
 			card->rx.qdio_err = 0;
-			card->rx.b_count = qdio_inspect_queue(CARD_DDEV(card),
-							      0, true,
-							      &card->rx.b_index,
-							      &card->rx.qdio_err);
+			card->rx.b_count =
+				qdio_inspect_input_queue(CARD_DDEV(card), 0,
+							 &card->rx.b_index,
+							 &card->rx.qdio_err);
 			if (card->rx.b_count <= 0) {
 				card->rx.b_count = 0;
 				break;
@@ -5900,8 +5900,8 @@ static void qeth_cq_poll(struct qeth_card *card)
 		unsigned int start, error;
 		int completed;
 
-		completed = qdio_inspect_queue(CARD_DDEV(card), 1, true, &start,
-					       &error);
+		completed = qdio_inspect_input_queue(CARD_DDEV(card), 1, &start,
+						     &error);
 		if (completed <= 0)
 			return;
 
@@ -6038,8 +6038,8 @@ static int qeth_tx_poll(struct napi_struct *napi, int budget)
 			return 0;
 		}
 
-		completed = qdio_inspect_queue(CARD_DDEV(card), queue_no, false,
-					       &start, &error);
+		completed = qdio_inspect_output_queue(CARD_DDEV(card), queue_no,
+						      &start, &error);
 		if (completed <= 0) {
 			/* Ensure we see TX completion for pending work: */
 			if (napi_complete_done(napi, 0) &&

drivers/s390/scsi/zfcp_qdio.c

@@ -79,7 +79,7 @@ static void zfcp_qdio_request_tasklet(struct tasklet_struct *tasklet)
 	unsigned int start, error;
 	int completed;
 
-	completed = qdio_inspect_queue(cdev, 0, false, &start, &error);
+	completed = qdio_inspect_output_queue(cdev, 0, &start, &error);
 	if (completed > 0) {
 		if (error) {
 			zfcp_qdio_handler_error(qdio, "qdreqt1", error);
@@ -169,7 +169,7 @@ static void zfcp_qdio_irq_tasklet(struct tasklet_struct *tasklet)
 		tasklet_schedule(&qdio->request_tasklet);
 
 	/* Check the Response Queue: */
-	completed = qdio_inspect_queue(cdev, 0, true, &start, &error);
+	completed = qdio_inspect_input_queue(cdev, 0, &start, &error);
 	if (completed < 0)
 		return;
 	if (completed > 0)