linux-kernel - [PATCH 5.10 1/5] net: dsa: microchip: Fix probing KSZ87xx switch with DT node for host port

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Date:   Mon, 16 Aug 2021 20:09:09 +0200
From:   Ben Hutchings <ben.hutchings@...d.be>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Marek Vasut <marex@...x.de>
Subject: [PATCH 5.10 1/5] net: dsa: microchip: Fix probing KSZ87xx switch
 with DT node for host port

The ksz8795 and ksz9477 drivers differ in the way they count ports.
For ksz8795, ksz_device::port_cnt does not include the host port
whereas for ksz9477 it does.  This inconsistency was fixed in Linux
5.11 by a series of changes, but remains in 5.10-stable.

When probing, the common code treats a port device node with an
address >= dev->port_cnt as a fatal error.  As a minimal fix, change
it to compare again dev->mib_port_cnt.  This is the length of the
dev->ports array that the port number will be used to index, and
always includes the host port.

Cc: Woojung Huh <woojung.huh@...rochip.com>
Cc: Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Cc: Michael Grzeschik <m.grzeschik@...gutronix.de>
Cc: Marek Vasut <marex@...x.de>
Signed-off-by: Ben Hutchings <ben.hutchings@...d.be>
---
 drivers/net/dsa/microchip/ksz_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index d4a64dbde315..88fa0779e0bc 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -432,7 +432,7 @@ int ksz_switch_register(struct ksz_device *dev,
 				if (of_property_read_u32(port, "reg",
 							 &port_num))
 					continue;
-				if (port_num >= dev->port_cnt)
+				if (port_num >= dev->mib_port_cnt)
 					return -EINVAL;
 				of_get_phy_mode(port,
 						&dev->ports[port_num].interface);
-- 
2.20.1