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Subject[PATCH 4.14 214/217] net: dsa: b53: Fix calculating number of switch ports
Date
From: Rafał Miłecki <rafal@milecki.pl>

[ Upstream commit cdb067d31c0fe4cce98b9d15f1f2ef525acaa094 ]

It isn't true that CPU port is always the last one. Switches BCM5301x
have 9 ports (port 6 being inactive) and they use port 5 as CPU by
default (depending on design some other may be CPU ports too).

A more reliable way of determining number of ports is to check for the
last set bit in the "enabled_ports" bitfield.

This fixes b53 internal state, it will allow providing accurate info to
the DSA and is required to fix BCM5301x support.

Fixes: 967dd82ffc52 ("net: dsa: b53: Add support for Broadcom RoboSwitch")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/dsa/b53/b53_common.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 820aed3e2352..9fff49229435 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -1843,9 +1843,8 @@ static int b53_switch_init(struct b53_device *dev)
dev->cpu_port = 5;
}

- /* cpu port is always last */
- dev->num_ports = dev->cpu_port + 1;
dev->enabled_ports |= BIT(dev->cpu_port);
+ dev->num_ports = fls(dev->enabled_ports);

dev->ports = devm_kzalloc(dev->dev,
sizeof(struct b53_port) * dev->num_ports,
--
2.30.2


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