netdev - [PATCH net-next 3/3] net: ethernet: am65-cpsw: Error out if Enable TX/RX channel fails

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Date: Mon, 13 Nov 2023 13:07:08 +0200
From: Roger Quadros <rogerq@...nel.org>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: vladimir.oltean@....com,
	s-vadapalli@...com,
	r-gunasekaran@...com,
	srk@...com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Roger Quadros <rogerq@...nel.org>
Subject: [PATCH net-next 3/3] net: ethernet: am65-cpsw: Error out if Enable TX/RX channel fails

k3_udma_glue_enable_rx/tx_chn returns error code on failure.
Bail out on error while enabling TX/RX channel.

Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 33 +++++++++++++++++++-----
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 7c440899c93c..340f25bf33b1 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -372,7 +372,7 @@ static void am65_cpsw_init_port_emac_ale(struct am65_cpsw_port *port);
 static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
 {
 	struct am65_cpsw_host *host_p = am65_common_get_host(common);
-	int port_idx, i, ret;
+	int port_idx, i, ret, tx;
 	struct sk_buff *skb;
 	u32 val, port_mask;
 
@@ -453,13 +453,22 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
 		}
 		kmemleak_not_leak(skb);
 	}
-	k3_udma_glue_enable_rx_chn(common->rx_chns.rx_chn);
 
-	for (i = 0; i < common->tx_ch_num; i++) {
-		ret = k3_udma_glue_enable_tx_chn(common->tx_chns[i].tx_chn);
-		if (ret)
-			return ret;
-		napi_enable(&common->tx_chns[i].napi_tx);
+	ret = k3_udma_glue_enable_rx_chn(common->rx_chns.rx_chn);
+	if (ret) {
+		dev_err(common->dev, "couldn't enable rx chn: %d\n", ret);
+		return ret;
+	}
+
+	for (tx = 0; tx < common->tx_ch_num; tx++) {
+		ret = k3_udma_glue_enable_tx_chn(common->tx_chns[tx].tx_chn);
+		if (ret) {
+			dev_err(common->dev, "couldn't enable tx chn %d: %d\n",
+				tx, ret);
+			tx--;
+			goto fail_tx;
+		}
+		napi_enable(&common->tx_chns[tx].napi_tx);
 	}
 
 	napi_enable(&common->napi_rx);
@@ -470,6 +479,16 @@ static int am65_cpsw_nuss_common_open(struct am65_cpsw_common *common)
 
 	dev_dbg(common->dev, "cpsw_nuss started\n");
 	return 0;
+
+fail_tx:
+	while (tx >= 0) {
+		napi_disable(&common->tx_chns[tx].napi_tx);
+		k3_udma_glue_disable_tx_chn(common->tx_chns[tx].tx_chn);
+		tx--;
+	}
+
+	k3_udma_glue_disable_rx_chn(common->rx_chns.rx_chn);
+	return ret;
 }
 
 static void am65_cpsw_nuss_tx_cleanup(void *data, dma_addr_t desc_dma);
-- 
2.34.1