[PATCH net-next] dmaengine: ti: k3-udma-glue: clean up return in k3_udma_glue_rx_get_irq()

[Dan Carpenter]

Currently the k3_udma_glue_rx_get_irq() function returns either negative
error codes or zero on error.  Generally, in the kernel, zero means
success so this be confusing and has caused bugs in the past.  Also the
"tx" version of this function only returns negative error codes.  Let's
clean this "rx" function so both functions match.

This patch has no effect on runtime.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 drivers/dma/ti/k3-udma-glue.c                | 3 +++
 drivers/net/ethernet/ti/am65-cpsw-nuss.c     | 4 ++--
 drivers/net/ethernet/ti/icssg/icssg_common.c | 4 +---
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/ti/k3-udma-glue.c b/drivers/dma/ti/k3-udma-glue.c
index c9b93055dc9d..b96b448a0e69 100644
--- a/drivers/dma/ti/k3-udma-glue.c
+++ b/drivers/dma/ti/k3-udma-glue.c
@@ -1531,6 +1531,9 @@ int k3_udma_glue_rx_get_irq(struct k3_udma_glue_rx_channel *rx_chn,
 		flow->virq = k3_ringacc_get_ring_irq_num(flow->ringrx);
 	}
 
+	if (!flow->virq)
+		return -ENXIO;
+
 	return flow->virq;
 }
 EXPORT_SYMBOL_GPL(k3_udma_glue_rx_get_irq);
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 4e50b3792888..8c26acc9cde1 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2424,10 +2424,10 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
 
 		rx_chn->irq = k3_udma_glue_rx_get_irq(rx_chn->rx_chn, i);
 
-		if (rx_chn->irq <= 0) {
+		if (rx_chn->irq < 0) {
 			dev_err(dev, "Failed to get rx dma irq %d\n",
 				rx_chn->irq);
-			ret = -ENXIO;
+			ret = rx_chn->irq;
 			goto err;
 		}
 	}
diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
index 088ab8076db4..cac7863c5cb2 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_common.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
@@ -440,9 +440,7 @@ int prueth_init_rx_chns(struct prueth_emac *emac,
 			fdqring_id = k3_udma_glue_rx_flow_get_fdq_id(rx_chn->rx_chn,
 								     i);
 		ret = k3_udma_glue_rx_get_irq(rx_chn->rx_chn, i);
-		if (ret <= 0) {
-			if (!ret)
-				ret = -ENXIO;
+		if (ret < 0) {
 			netdev_err(ndev, "Failed to get rx dma irq");
 			goto fail;
 		}
-- 
2.39.2