[PATCH AUTOSEL 4.19 12/26] net: dsa: qca8k: Use up to 7 ports for all operations

Sasha Levin
2019-10-09T17:30:42Z

From: Michal Vokáč <michal.vokac@ysoft.com>

[ Upstream commit 7ae6d93c8f052b7a77ba56ed0f654e22a2876739 ]

The QCA8K family supports up to 7 ports. So use the existing
QCA8K_NUM_PORTS define to allocate the switch structure and limit all
operations with the switch ports.

This was not an issue until commit 0394a63acfe2 ("net: dsa: enable and
disable all ports") disabled all unused ports. Since the unused ports 7-11
are outside of the correct register range on this switch some registers
were rewritten with invalid content.

Fixes: 6b93fb46480a ("net-next: dsa: add new driver for qca8xxx family")
Fixes: a0c02161ecfc ("net: dsa: variable number of ports")
Fixes: 0394a63acfe2 ("net: dsa: enable and disable all ports")
Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/dsa/qca8k.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index bdd8f2df66303..33232cc9fb04d 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -543,7 +543,7 @@ qca8k_setup(struct dsa_switch *ds)
BIT(0) << QCA8K_GLOBAL_FW_CTRL1_UC_DP_S);

/* Setup connection between CPU port & user ports */
- for (i = 0; i < DSA_MAX_PORTS; i++) {
+ for (i = 0; i < QCA8K_NUM_PORTS; i++) {
/* CPU port gets connected to all user ports of the switch */
if (dsa_is_cpu_port(ds, i)) {
qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(QCA8K_CPU_PORT),
@@ -897,7 +897,7 @@ qca8k_sw_probe(struct mdio_device *mdiodev)
if (id != QCA8K_ID_QCA8337)
return -ENODEV;

- priv->ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
+ priv->ds = dsa_switch_alloc(&mdiodev->dev, QCA8K_NUM_PORTS);
if (!priv->ds)
return -ENOMEM;

--
2.20.1