netdev - [PATCH] phylink: Improve error message when validate failed

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Date:   Mon,  2 Mar 2020 00:55:02 +0100
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux@...linux.org.uk, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com,
        Hauke Mehrtens <hauke@...ke-m.de>
Subject: [PATCH] phylink: Improve error message when validate failed

This should improve the error message when the PHY validate in the MAC
driver failed. I ran into this problem multiple times that I put wrong
interface values into the device tree and was searching why it is
failing with -22 (-EINVAL). This should make it easier to spot the
problem.

Signed-off-by: Hauke Mehrtens <hauke@...ke-m.de>
---
 drivers/net/phy/phylink.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index b4367fab7899..5347275215be 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -797,8 +797,14 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 		config.interface = interface;
 
 	ret = phylink_validate(pl, supported, &config);
-	if (ret)
+	if (ret) {
+		phylink_warn(pl, "validation of %s with support %*pb and advertisement %*pb failed: %d\n",
+			     phy_modes(config.interface),
+			     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->supported,
+			     __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising,
+			     ret);
 		return ret;
+	}
 
 	phy->phylink = pl;
 	phy->phy_link_change = phylink_phy_change;
-- 
2.20.1