netdev - [PATCH v1 net] net: ethernet: mscc: ocelot: bug fix when writing MAC speed

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Message-Id: <20210915062103.149287-1-colin.foster@in-advantage.com>
Date:   Tue, 14 Sep 2021 23:21:02 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     colin.foster@...advantage.com,
        Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 net] net: ethernet: mscc: ocelot: bug fix when writing MAC speed

Converting the ocelot driver to use phylink, commit e6e12df625f2, uses mac_speed
in ocelot_phylink_mac_link_up instead of the local variable speed. Stale
references to the old variable were missed, and so were always performing
invalid second writes to the DEV_CLOCK_CFG and ANA_PFC_CFG registers.

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
---
 drivers/net/ethernet/mscc/ocelot.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index c581b955efb3..91a31523be8f 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -566,11 +566,11 @@ void ocelot_phylink_mac_link_up(struct ocelot *ocelot, int port,
 	/* Take MAC, Port, Phy (intern) and PCS (SGMII/Serdes) clock out of
 	 * reset
 	 */
-	ocelot_port_writel(ocelot_port, DEV_CLOCK_CFG_LINK_SPEED(speed),
+	ocelot_port_writel(ocelot_port, DEV_CLOCK_CFG_LINK_SPEED(mac_speed),
 			   DEV_CLOCK_CFG);
 
 	/* No PFC */
-	ocelot_write_gix(ocelot, ANA_PFC_PFC_CFG_FC_LINK_SPEED(speed),
+	ocelot_write_gix(ocelot, ANA_PFC_PFC_CFG_FC_LINK_SPEED(mac_speed),
 			 ANA_PFC_PFC_CFG, port);
 
 	/* Core: Enable port for frame transfer */
-- 
2.25.1