linux-kernel - [PATCH net-next] net: ethernet: ti: am65-cpsw: Fix PM runtime leakage in am65_cpsw_nuss_ndo_slave

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Message-Id: <20221208105534.63709-1-rogerq@kernel.org>
Date:   Thu,  8 Dec 2022 12:55:34 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     davem@...emloft.net, maciej.fijalkowski@...el.com, kuba@...nel.org
Cc:     andrew@...n.ch, edumazet@...gle.com, pabeni@...hat.com,
        vigneshr@...com, s-vadapalli@...com, linux-omap@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Roger Quadros <rogerq@...nel.org>
Subject: [PATCH net-next] net: ethernet: ti: am65-cpsw: Fix PM runtime leakage in am65_cpsw_nuss_ndo_slave_open()

Ensure pm_runtime_put() is issued in error path.

Reported-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index b8f7080434cb..58c20e4c0e9f 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -573,20 +573,21 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
 	reg = cpsw_sl_reg_read(port->slave.mac_sl, CPSW_SL_SOFT_RESET);
 	if (reg) {
 		dev_err(common->dev, "soft RESET didn't complete\n");
-		return -ETIMEDOUT;
+		ret = -ETIMEDOUT;
+		goto runtime_put;
 	}
 
 	/* Notify the stack of the actual queue counts. */
 	ret = netif_set_real_num_tx_queues(ndev, common->tx_ch_num);
 	if (ret) {
 		dev_err(common->dev, "cannot set real number of tx queues\n");
-		return ret;
+		goto runtime_put;
 	}
 
 	ret = netif_set_real_num_rx_queues(ndev, AM65_CPSW_MAX_RX_QUEUES);
 	if (ret) {
 		dev_err(common->dev, "cannot set real number of rx queues\n");
-		return ret;
+		goto runtime_put;
 	}
 
 	for (i = 0; i < common->tx_ch_num; i++)
@@ -594,7 +595,7 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
 
 	ret = am65_cpsw_nuss_common_open(common);
 	if (ret)
-		return ret;
+		goto runtime_put;
 
 	common->usage_count++;
 
@@ -622,6 +623,10 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
 error_cleanup:
 	am65_cpsw_nuss_ndo_slave_stop(ndev);
 	return ret;
+
+runtime_put:
+	pm_runtime_put(common->dev);
+	return ret;
 }
 
 static void am65_cpsw_nuss_rx_cleanup(void *data, dma_addr_t desc_dma)
-- 
2.34.1