[PATCH 3/3 net] dmaengine: ti: k3-udma-glue: clean up k3_udma_glue_tx_get_irq() return

[Dan Carpenter <dan.carpenter@linaro.org>]

The k3_udma_glue_tx_get_irq() function currently returns negative error
codes on error, zero on error and positive values for success.  This
complicates life for the callers who need to propagate the error code.
Also GCC will not warn about unsigned comparisons when you check:

	if (unsigned_irq <= 0)

All the callers have been fixed now but let's just make this easy going
forward.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 drivers/dma/ti/k3-udma-glue.c                | 3 +++
 drivers/net/ethernet/ti/am65-cpsw-nuss.c     | 4 ++--
 drivers/net/ethernet/ti/icssg/icssg_prueth.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 789193ed0386..c278d5facf7d 100644
--- a/drivers/dma/ti/k3-udma-glue.c
+++ b/drivers/dma/ti/k3-udma-glue.c
@@ -558,6 +558,9 @@ int k3_udma_glue_tx_get_irq(struct k3_udma_glue_tx_channel *tx_chn)
 		tx_chn->virq = k3_ringacc_get_ring_irq_num(tx_chn->ringtxcq);
 	}
 
+	if (!tx_chn->virq)
+		return -ENXIO;
+
 	return tx_chn->virq;
 }
 EXPORT_SYMBOL_GPL(k3_udma_glue_tx_get_irq);
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 31e84c503e22..24120605502f 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1747,10 +1747,10 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
 		}
 
 		tx_chn->irq = k3_udma_glue_tx_get_irq(tx_chn->tx_chn);
-		if (tx_chn->irq <= 0) {
+		if (tx_chn->irq < 0) {
 			dev_err(dev, "Failed to get tx dma irq %d\n",
 				tx_chn->irq);
-			ret = tx_chn->irq ?: -ENXIO;
+			ret = tx_chn->irq;
 			goto err;
 		}
 
diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
index 89c0c3449d98..3c611b9aaecf 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -317,9 +317,7 @@ static int prueth_init_tx_chns(struct prueth_emac *emac)
 		}
 
 		ret = k3_udma_glue_tx_get_irq(tx_chn->tx_chn);
-		if (ret <= 0) {
-			if (!ret)
-				ret = -EINVAL;
+		if (ret < 0) {
 			netdev_err(ndev, "failed to get tx irq\n");
 			goto fail;
 		}
-- 
2.39.2