linux-kernel - [PATCH AUTOSEL for 4.15 38/78] sfp: fix non-detection of PHY

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Message-ID: <20180308045525.7662-38-alexander.levin@microsoft.com>
Date:   Thu, 8 Mar 2018 04:56:18 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Russell King <rmk+kernel@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 38/78] sfp: fix non-detection of PHY

From: Russell King <rmk+kernel@...linux.org.uk>

[ Upstream commit 20b56ed9f8adfb9a7fb1c878878c54aa4ed645c1 ]

The detection of a PHY changed in commit e98a3aabf85f ("mdio_bus: don't
return NULL from mdiobus_scan()") which now causes sfp to print an
error message.  Update for this change.

Fixes: 73970055450e ("sfp: add SFP module support")
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/phy/sfp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index dec35888c429..10b77ac781ca 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -315,12 +315,12 @@ static void sfp_sm_probe_phy(struct sfp *sfp)
 	msleep(T_PHY_RESET_MS);
 
 	phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
-	if (IS_ERR(phy)) {
-		dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
+	if (phy == ERR_PTR(-ENODEV)) {
+		dev_info(sfp->dev, "no PHY detected\n");
 		return;
 	}
-	if (!phy) {
-		dev_info(sfp->dev, "no PHY detected\n");
+	if (IS_ERR(phy)) {
+		dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
 		return;
 	}
 
-- 
2.14.1