[PATCH 6.1 093/137] net: dsa: mv88e6xxx: Fix error when setting port policy on mv88e6393x

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Rashleigh <peter@xxxxxxxxxxxx>

[ Upstream commit 12bc14949c4a7272b509af0f1022a0deeb215fd8 ]

mv88e6393x_port_set_policy doesn't correctly shift the ptr value when
converting the policy format between the old and new styles, so the
target register ends up with the ptr being written over the data bits.

Shift the pointer to align with the format expected by
mv88e6393x_port_policy_write().

Fixes: 6584b26020fc ("net: dsa: mv88e6xxx: implement .port_set_policy for Amethyst")
Signed-off-by: Peter Rashleigh <peter@xxxxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Message-ID: <20241016040822.3917-1-peter@xxxxxxxxxxxx>
Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/dsa/mv88e6xxx/port.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/dsa/mv88e6xxx/port.c b/drivers/net/dsa/mv88e6xxx/port.c
index f79cf716c541f..553f577c25a6b 100644
--- a/drivers/net/dsa/mv88e6xxx/port.c
+++ b/drivers/net/dsa/mv88e6xxx/port.c
@@ -1728,6 +1728,7 @@ int mv88e6393x_port_set_policy(struct mv88e6xxx_chip *chip, int port,
 	ptr = shift / 8;
 	shift %= 8;
 	mask >>= ptr * 8;
+	ptr <<= 8;
 
 	err = mv88e6393x_port_policy_read(chip, port, ptr, &reg);
 	if (err)
-- 
2.43.0