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net: dsa: microchip: set the correct number of ports

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[ Upstream commit af199a1a9cb02ec0194804bd46c174b6db262075 ]

The number of ports is incorrectly set to the maximum available for a DSA
switch. Even if the extra ports are not used, this causes some functions
to be called later, like port_disable() and port_stp_state_set(). If the
driver doesn't check the port index, it will end up modifying unknown
registers.

Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.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>
This commit is contained in:
Codrin Ciubotariu 2020-07-02 12:44:50 +03:00 committed by Greg Kroah-Hartman
parent fd3a612d98
commit d9b8206e53
2 changed files with 6 additions and 0 deletions
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3
drivers/net/dsa/microchip/ksz8795.c
View File

@ -1267,6 +1267,9 @@ static int ksz8795_switch_init(struct ksz_device *dev)
return -ENOMEM;
}
/* set the real number of ports */
dev->ds->num_ports = dev->port_cnt;
return 0;
}

3
drivers/net/dsa/microchip/ksz9477.c
View File

@ -1587,6 +1587,9 @@ static int ksz9477_switch_init(struct ksz_device *dev)
return -ENOMEM;
}
/* set the real number of ports */
dev->ds->num_ports = dev->port_cnt;
return 0;
}