net: pse-pd: pd692x0: Fix power limit retrieval

[ Upstream commit f6093c5 ]

Fix incorrect data offset read in the pd692x0_pi_get_pw_limit callback.
The issue was previously unnoticed as it was only used by the regulator
API and not thoroughly tested, since the PSE is mainly controlled via
ethtool.

The function became actively used by ethtool after commit 3e9dbfe
("net: pse-pd: Split ethtool_get_status into multiple callbacks"),
which led to the discovery of this issue.

Fix it by using the correct data offset.

Fixes: a87e699 ("net: pse-pd: pd692x0: Enhance with new current limit and voltage read callbacks")
Signed-off-by: Kory Maincent <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
(cherry picked from commit a055b1bc4009cfdf5b160a321f9638f880c89ce6)
Signed-off-by: Jack Vogel <[email protected]>

Author: kmaincent

drivers/net/pse-pd/pd692x0.c

@@ -1012,7 +1012,7 @@ static int pd692x0_pi_get_pw_limit(struct pse_controller_dev *pcdev,
 	if (ret < 0)
 		return ret;
 
-	return pd692x0_pi_get_pw_from_table(buf.data[2], buf.data[3]);
+	return pd692x0_pi_get_pw_from_table(buf.data[0], buf.data[1]);
 }
 
 static int pd692x0_pi_set_pw_limit(struct pse_controller_dev *pcdev,