mei: cleanup slots to data conversions

Cleanup conversions between slots and data.
Define MEI_SLOT_SIZE instead of using 4 or sizeof(u32) across
the source code.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/client.c

@@ -1597,7 +1597,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 	/* Split the message only if we can write the whole host buffer */
 	} else if ((u32)slots == dev->hbuf_depth) {
 		msg_slots = slots;
-		len = (slots * sizeof(u32)) - sizeof(struct mei_msg_hdr);
+		len = mei_slots2data(slots) - sizeof(struct mei_msg_hdr);
 		mei_hdr.length = len;
 		mei_hdr.msg_complete = 0;
 	} else {

drivers/misc/mei/hw-me.c

@@ -511,7 +511,7 @@ static int mei_me_hbuf_empty_slots(struct mei_device *dev)
  */
 static size_t mei_me_hbuf_max_len(const struct mei_device *dev)
 {
-	return dev->hbuf_depth * sizeof(u32) - sizeof(struct mei_msg_hdr);
+	return mei_slots2data(dev->hbuf_depth) - sizeof(struct mei_msg_hdr);
 }
 
 
@@ -549,7 +549,7 @@ static int mei_me_hbuf_write(struct mei_device *dev,
 
 	mei_me_hcbww_write(dev, *((u32 *) header));
 
-	for (i = 0; i < length / 4; i++)
+	for (i = 0; i < length / MEI_SLOT_SIZE; i++)
 		mei_me_hcbww_write(dev, reg_buf[i]);
 
 	rem = length & 0x3;
@@ -608,7 +608,7 @@ static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
 {
 	u32 *reg_buf = (u32 *)buffer;
 
-	for (; buffer_length >= sizeof(u32); buffer_length -= sizeof(u32))
+	for (; buffer_length >= MEI_SLOT_SIZE; buffer_length -= MEI_SLOT_SIZE)
 		*reg_buf++ = mei_me_mecbrw_read(dev);
 
 	if (buffer_length > 0) {

drivers/misc/mei/hw-txe.c

@@ -682,7 +682,7 @@ static void mei_txe_hw_config(struct mei_device *dev)
 	struct mei_txe_hw *hw = to_txe_hw(dev);
 
 	/* Doesn't change in runtime */
-	dev->hbuf_depth = PAYLOAD_SIZE / 4;
+	dev->hbuf_depth = PAYLOAD_SIZE / MEI_SLOT_SIZE;
 
 	hw->aliveness = mei_txe_aliveness_get(dev);
 	hw->readiness = mei_txe_readiness_get(dev);
@@ -766,7 +766,7 @@ static int mei_txe_write(struct mei_device *dev,
  *
  * @dev: the device structure
  *
- * Return: the PAYLOAD_SIZE - 4
+ * Return: the PAYLOAD_SIZE - header size
  */
 static size_t mei_txe_hbuf_max_len(const struct mei_device *dev)
 {
@@ -797,7 +797,7 @@ static int mei_txe_hbuf_empty_slots(struct mei_device *dev)
 static int mei_txe_count_full_read_slots(struct mei_device *dev)
 {
 	/* read buffers has static size */
-	return  PAYLOAD_SIZE / 4;
+	return  PAYLOAD_SIZE / MEI_SLOT_SIZE;
 }
 
 /**
@@ -839,7 +839,7 @@ static int mei_txe_read(struct mei_device *dev,
 	dev_dbg(dev->dev, "buffer-length = %lu buf[0]0x%08X\n",
 		len, mei_txe_out_data_read(dev, 0));
 
-	for (i = 0; i < len / 4; i++) {
+	for (i = 0; i < len / MEI_SLOT_SIZE; i++) {
 		/* skip header: index starts from 1 */
 		reg = mei_txe_out_data_read(dev, i + 1);
 		dev_dbg(dev->dev, "buf[%d] = 0x%08X\n", i, reg);

drivers/misc/mei/mei_dev.h

@@ -26,7 +26,9 @@
 #include "hw.h"
 #include "hbm.h"
 
-#define MEI_RD_MSG_BUF_SIZE           (128 * sizeof(u32))
+#define MEI_SLOT_SIZE             sizeof(u32)
+#define MEI_RD_MSG_BUF_SIZE       (128 * MEI_SLOT_SIZE)
+
 
 /*
  * Number of Maximum MEI Clients
@@ -540,7 +542,7 @@ static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
  */
 static inline u32 mei_data2slots(size_t length)
 {
-	return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
+	return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, MEI_SLOT_SIZE);
 }
 
 /**
@@ -552,7 +554,7 @@ static inline u32 mei_data2slots(size_t length)
  */
 static inline u32 mei_slots2data(int slots)
 {
-	return slots * 4;
+	return slots * MEI_SLOT_SIZE;
 }
 
 /*