linux-kernel - [PATCH 5.16 168/285] net: stmmac: Fix unset max_speed difference between DT and non-DT platforms

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Date:   Tue, 12 Apr 2022 08:30:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 168/285] net: stmmac: Fix unset max_speed difference between DT and non-DT platforms

From: Chen-Yu Tsai <wens@...e.org>

[ Upstream commit c21cabb0fd0b54b8b54235fc1ecfe1195a23bcb2 ]

In commit 9cbadf094d9d ("net: stmmac: support max-speed device tree
property"), when DT platforms don't set "max-speed", max_speed is set to
-1; for non-DT platforms, it stays the default 0.

Prior to commit eeef2f6b9f6e ("net: stmmac: Start adding phylink support"),
the check for a valid max_speed setting was to check if it was greater
than zero. This commit got it right, but subsequent patches just checked
for non-zero, which is incorrect for DT platforms.

In commit 92c3807b9ac3 ("net: stmmac: convert to phylink_get_linkmodes()")
the conversion switched completely to checking for non-zero value as a
valid value, which caused 1000base-T to stop getting advertised by
default.

Instead of trying to fix all the checks, simply leave max_speed alone if
DT property parsing fails.

Fixes: 9cbadf094d9d ("net: stmmac: support max-speed device tree property")
Fixes: 92c3807b9ac3 ("net: stmmac: convert to phylink_get_linkmodes()")
Signed-off-by: Chen-Yu Tsai <wens@...e.org>
Acked-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Link: https://lore.kernel.org/r/20220331184832.16316-1-wens@kernel.org
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 5d29f336315b..11e1055e8260 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -431,8 +431,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 	plat->phylink_node = np;
 
 	/* Get max speed of operation from device tree */
-	if (of_property_read_u32(np, "max-speed", &plat->max_speed))
-		plat->max_speed = -1;
+	of_property_read_u32(np, "max-speed", &plat->max_speed);
 
 	plat->bus_id = of_alias_get_id(np, "ethernet");
 	if (plat->bus_id < 0)
-- 
2.35.1