mei: revamp host buffer interface function

1. Use unified _hbuf_ prefix for host/write buffer functions.
2. Cleanup the code w/o functional changes.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/interface.c

@@ -58,55 +58,48 @@ void mei_disable_interrupts(struct mei_device *dev)
 }
 
 /**
- * _host_get_filled_slots - gets number of device filled buffer slots
+ * mei_hbuf_filled_slots - gets number of device filled buffer slots
  *
  * @device: the device structure
  *
  * returns number of filled slots
  */
-static unsigned char _host_get_filled_slots(const struct mei_device *dev)
+static unsigned char mei_hbuf_filled_slots(struct mei_device *dev)
 {
 	char read_ptr, write_ptr;
 
+	dev->host_hw_state = mei_hcsr_read(dev);
+
 	read_ptr = (char) ((dev->host_hw_state & H_CBRP) >> 8);
 	write_ptr = (char) ((dev->host_hw_state & H_CBWP) >> 16);
 
 	return (unsigned char) (write_ptr - read_ptr);
 }
 
 /**
- * mei_host_buffer_is_empty - checks if host buffer is empty.
+ * mei_hbuf_is_empty - checks if host buffer is empty.
  *
  * @dev: the device structure
  *
- * returns 1 if empty, 0 - otherwise.
+ * returns true if empty, false - otherwise.
  */
-int mei_host_buffer_is_empty(struct mei_device *dev)
+bool mei_hbuf_is_empty(struct mei_device *dev)
 {
-	unsigned char filled_slots;
-
-	dev->host_hw_state = mei_hcsr_read(dev);
-	filled_slots = _host_get_filled_slots(dev);
-
-	if (filled_slots == 0)
-		return 1;
-
-	return 0;
+	return mei_hbuf_filled_slots(dev) == 0;
 }
 
 /**
- * mei_count_empty_write_slots - counts write empty slots.
+ * mei_hbuf_empty_slots - counts write empty slots.
  *
  * @dev: the device structure
  *
  * returns -1(ESLOTS_OVERFLOW) if overflow, otherwise empty slots count
  */
-int mei_count_empty_write_slots(struct mei_device *dev)
+int mei_hbuf_empty_slots(struct mei_device *dev)
 {
 	unsigned char filled_slots, empty_slots;
 
-	dev->host_hw_state = mei_hcsr_read(dev);
-	filled_slots = _host_get_filled_slots(dev);
+	filled_slots = mei_hbuf_filled_slots(dev);
 	empty_slots = dev->hbuf_depth - filled_slots;
 
 	/* check for overflow */
@@ -139,7 +132,7 @@ int mei_write_message(struct mei_device *dev, struct mei_msg_hdr *header,
 			"mei_write_message header=%08x.\n",
 			*((u32 *) header));
 
-	empty_slots = mei_count_empty_write_slots(dev);
+	empty_slots = mei_hbuf_empty_slots(dev);
 	dev_dbg(&dev->pdev->dev, "empty slots = %hu.\n", empty_slots);
 
 	dw_cnt = (length + sizeof(*header) + 3) / 4;

drivers/misc/mei/interface.h

@@ -41,19 +41,21 @@ int mei_write_message(struct mei_device *dev,
 			     unsigned char *write_buffer,
 			     unsigned long write_length);
 
-int mei_host_buffer_is_empty(struct mei_device *dev);
+bool mei_hbuf_is_empty(struct mei_device *dev);
 
-int mei_count_full_read_slots(struct mei_device *dev);
-
-int mei_count_empty_write_slots(struct mei_device *dev);
-
-int mei_flow_ctrl_creds(struct mei_device *dev, struct mei_cl *cl);
+int mei_hbuf_empty_slots(struct mei_device *dev);
 
 static inline size_t mei_hbuf_max_data(const struct mei_device *dev)
 {
 	return dev->hbuf_depth * sizeof(u32) - sizeof(struct mei_msg_hdr);
 }
 
+int mei_count_full_read_slots(struct mei_device *dev);
+
+
+int mei_flow_ctrl_creds(struct mei_device *dev, struct mei_cl *cl);
+
+
 
 int mei_wd_send(struct mei_device *dev);
 int mei_wd_stop(struct mei_device *dev, bool preserve);

drivers/misc/mei/interrupt.c

@@ -280,7 +280,7 @@ static int _mei_irq_thread_iamthif_read(struct mei_device *dev, s32 *slots)
 	dev->iamthif_msg_buf_index = 0;
 	dev->iamthif_msg_buf_size = 0;
 	dev->iamthif_stall_timer = IAMTHIF_STALL_TIMER;
-	dev->mei_host_buffer_is_empty = mei_host_buffer_is_empty(dev);
+	dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
 	return 0;
 }
 
@@ -1199,11 +1199,11 @@ static int mei_irq_thread_write_handler(struct mei_io_list *cmpl_list,
 	struct mei_io_list *list;
 	int ret;
 
-	if (!mei_host_buffer_is_empty(dev)) {
+	if (!mei_hbuf_is_empty(dev)) {
 		dev_dbg(&dev->pdev->dev, "host buffer is not empty.\n");
 		return 0;
 	}
-	*slots = mei_count_empty_write_slots(dev);
+	*slots = mei_hbuf_empty_slots(dev);
 	if (*slots <= 0)
 		return -EMSGSIZE;
 
@@ -1558,7 +1558,7 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
 end:
 	dev_dbg(&dev->pdev->dev, "end of bottom half function.\n");
 	dev->host_hw_state = mei_hcsr_read(dev);
-	dev->mei_host_buffer_is_empty = mei_host_buffer_is_empty(dev);
+	dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
 
 	bus_message_received = false;
 	if (dev->recvd_msg && waitqueue_active(&dev->wait_recvd_msg)) {