netdev - [PATCH net-next] net: dsa: qca8k: Initialize the switch with correct number of ports

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Message-Id: <1571924818-27725-1-git-send-email-michal.vokac@ysoft.com>
Date:   Thu, 24 Oct 2019 15:46:58 +0200
From:   Michal Vokáč <michal.vokac@...ft.com>
To:     Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Michal Vokáč <michal.vokac@...ft.com>
Subject: [PATCH net-next] net: dsa: qca8k: Initialize the switch with correct number of ports

Since commit 0394a63acfe2 ("net: dsa: enable and disable all ports")
the dsa core disables all unused ports of a switch. In this case
disabling ports with numbers higher than QCA8K_NUM_PORTS causes that
some switch registers are overwritten with incorrect content.

To fix this, initialize the dsa_switch->num_ports with correct number
of ports.

Fixes: 7e99e3470172 ("net: dsa: remove dsa_switch_alloc helper")
Signed-off-by: Michal Vokáč <michal.vokac@...ft.com>
---
I actually tried and gave a T-b tag to the whole series that contains
the offending commit but obviously I was not careful enough. Who knows
what was on my mind and what I actually tested back then. Sorry.

 drivers/net/dsa/qca8k.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 7e742cd491e8..36c6ed98f8e7 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1083,7 +1083,7 @@ qca8k_sw_probe(struct mdio_device *mdiodev)
 		return -ENOMEM;
 
 	priv->ds->dev = &mdiodev->dev;
-	priv->ds->num_ports = DSA_MAX_PORTS;
+	priv->ds->num_ports = QCA8K_NUM_PORTS;
 	priv->ds->priv = priv;
 	priv->ops = qca8k_switch_ops;
 	priv->ds->ops = &priv->ops;
-- 
2.1.4