netdev - [net v2 PATCH] net: ethernet: ti: cpsw_new: fix error handling in cpsw_ndo_vlan_rx_kill

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Date:   Mon, 24 Aug 2020 12:53:14 -0400
From:   Murali Karicheri <m-karicheri2@...com>
To:     <davem@...emloft.net>, <kuba@...nel.org>,
        <grygorii.strashko@...com>, <nsekhar@...com>,
        <linux-omap@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [net v2 PATCH] net: ethernet: ti: cpsw_new: fix error handling in cpsw_ndo_vlan_rx_kill_vid()

This patch fixes a bunch of issues in cpsw_ndo_vlan_rx_kill_vid()

 - pm_runtime_get_sync() returns non zero value. This results in
   non zero value return to caller which will be interpreted as error.
   So overwrite ret with zero.
 - Currently when VLAN interface is deleted, all of the VLAN mc addresses
   are removed from ALE table, however the return values from ale function
   calls are not checked. These functions can return error code -ENOENT.
   But that shouldn't happen in a normal case. So add error print to
   catch the situations so that these can be investigated and addressed.
   return zero in these cases as these are not real error case, but only
   serve to catch ALE table update related issues and help address the
   same in the driver.

Fixes: ed3525eda4c4 ("net: ethernet: ti: introduce cpsw switchdev based driver part 1 - dual-emac")
Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 v2 - updated based on comments from Grygorii.
 drivers/net/ethernet/ti/cpsw_new.c | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c
index 8d0a2bc7128d..61fa5063d751 100644
--- a/drivers/net/ethernet/ti/cpsw_new.c
+++ b/drivers/net/ethernet/ti/cpsw_new.c
@@ -1032,19 +1032,35 @@ static int cpsw_ndo_vlan_rx_kill_vid(struct net_device *ndev,
 		return ret;
 	}
 
+	/* reset the return code as pm_runtime_get_sync() can return
+	 * non zero values as well.
+	 */
+	ret = 0;
 	for (i = 0; i < cpsw->data.slaves; i++) {
 		if (cpsw->slaves[i].ndev &&
-		    vid == cpsw->slaves[i].port_vlan)
+		    vid == cpsw->slaves[i].port_vlan) {
+			ret = -EINVAL;
 			goto err;
+		}
 	}
 
 	dev_dbg(priv->dev, "removing vlanid %d from vlan filter\n", vid);
-	cpsw_ale_del_vlan(cpsw->ale, vid, 0);
-	cpsw_ale_del_ucast(cpsw->ale, priv->mac_addr,
-			   HOST_PORT_NUM, ALE_VLAN, vid);
-	cpsw_ale_del_mcast(cpsw->ale, priv->ndev->broadcast,
-			   0, ALE_VLAN, vid);
+	ret = cpsw_ale_del_vlan(cpsw->ale, vid, 0);
+	if (ret)
+		dev_err(priv->dev, "%s: failed %d: ret %d\n",
+			__func__, __LINE__, ret);
+	ret = cpsw_ale_del_ucast(cpsw->ale, priv->mac_addr,
+				 HOST_PORT_NUM, ALE_VLAN, vid);
+	if (ret)
+		dev_err(priv->dev, "%s: failed %d: ret %d\n",
+			__func__, __LINE__, ret);
+	ret = cpsw_ale_del_mcast(cpsw->ale, priv->ndev->broadcast,
+				 0, ALE_VLAN, vid);
+	if (ret)
+		dev_err(priv->dev, "%s: failed %d: ret %d\n",
+			__func__, __LINE__, ret);
 	cpsw_ale_flush_multicast(cpsw->ale, ALE_PORT_HOST, vid);
+	ret = 0;
 err:
 	pm_runtime_put(cpsw->dev);
 	return ret;
-- 
2.17.1