crypto: qat - refactor ring-related debug functions

Refactor the functions `adf_ring_start()` and `adf_ring_next()` to
improve readability.

This does not introduce any functional change.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Ahsan Atta <ahsan.atta@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: gcabiddu

drivers/crypto/intel/qat/qat_common/adf_transport_debug.c

@@ -10,16 +10,21 @@
 static DEFINE_MUTEX(ring_read_lock);
 static DEFINE_MUTEX(bank_read_lock);
 
+#define ADF_RING_NUM_MSGS(ring)					\
+	(ADF_SIZE_TO_RING_SIZE_IN_BYTES(ring->ring_size) /	\
+	ADF_MSG_SIZE_TO_BYTES(ring->msg_size))
+
 static void *adf_ring_start(struct seq_file *sfile, loff_t *pos)
 {
 	struct adf_etr_ring_data *ring = sfile->private;
+	unsigned int num_msg = ADF_RING_NUM_MSGS(ring);
+	loff_t val = *pos;
 
 	mutex_lock(&ring_read_lock);
-	if (*pos == 0)
+	if (val == 0)
 		return SEQ_START_TOKEN;
 
-	if (*pos >= (ADF_SIZE_TO_RING_SIZE_IN_BYTES(ring->ring_size) /
-		     ADF_MSG_SIZE_TO_BYTES(ring->msg_size)))
+	if (val >= num_msg)
 		return NULL;
 
 	return ring->base_addr +
@@ -29,15 +34,15 @@ static void *adf_ring_start(struct seq_file *sfile, loff_t *pos)
 static void *adf_ring_next(struct seq_file *sfile, void *v, loff_t *pos)
 {
 	struct adf_etr_ring_data *ring = sfile->private;
+	unsigned int num_msg = ADF_RING_NUM_MSGS(ring);
+	loff_t val = *pos;
+
+	(*pos)++;
 
-	if (*pos >= (ADF_SIZE_TO_RING_SIZE_IN_BYTES(ring->ring_size) /
-		     ADF_MSG_SIZE_TO_BYTES(ring->msg_size))) {
-		(*pos)++;
+	if (val >= num_msg)
 		return NULL;
-	}
 
-	return ring->base_addr +
-		(ADF_MSG_SIZE_TO_BYTES(ring->msg_size) * (*pos)++);
+	return ring->base_addr + (ADF_MSG_SIZE_TO_BYTES(ring->msg_size) * val);
 }
 
 static int adf_ring_show(struct seq_file *sfile, void *v)