[2/5] dmaengine: ti: k3-udma: Do not use ring_get_occ in udma_pop_from_ring

Commit Message

Peter Ujfalusi July 7, 2020, 9:10 a.m. UTC

The ring_get_occ is redundant as the k3_ringacc_ring_pop() is also
checking the occ of the ring.

With removing the ring_get_occ, the function can be simplified as well.

Signed-off-by: Peter Ujfalusi <[e-mail]>
---
 drivers/dma/ti/k3-udma.c | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

Patch

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 919669634d87..c2b3792bed54 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -588,7 +588,7 @@  static bool udma_desc_is_rx_flush(struct udma_chan *uc, dma_addr_t addr)
 static int udma_pop_from_ring(struct udma_chan *uc, dma_addr_t *addr)
 {
 	struct k3_ring *ring = NULL;
-	int ret = -ENOENT;
+	int ret;
 
 	switch (uc->config.dir) {
 	case DMA_DEV_TO_MEM:
@@ -599,26 +599,24 @@  static int udma_pop_from_ring(struct udma_chan *uc, dma_addr_t *addr)
 		ring = uc->tchan->tc_ring;
 		break;
 	default:
-		break;
+		return -ENOENT;
 	}
 
-	if (ring && k3_ringacc_ring_get_occ(ring)) {
-		ret = k3_ringacc_ring_pop(ring, addr);
-		if (ret)
-			return ret;
+	ret = k3_ringacc_ring_pop(ring, addr);
+	if (ret)
+		return ret;
 
-		rmb(); /* Ensure that reads are not moved before this point */
+	rmb(); /* Ensure that reads are not moved before this point */
 
-		/* Teardown completion */
-		if (cppi5_desc_is_tdcm(*addr))
-			return ret;
+	/* Teardown completion */
+	if (cppi5_desc_is_tdcm(*addr))
+		return 0;
 
-		/* Check for flush descriptor */
-		if (udma_desc_is_rx_flush(uc, *addr))
-			return -ENOENT;
-	}
+	/* Check for flush descriptor */
+	if (udma_desc_is_rx_flush(uc, *addr))
+		return -ENOENT;
 
-	return ret;
+	return 0;
 }
 
 static void udma_reset_rings(struct udma_chan *uc)