netdev - [PATCH v2 net] net: phy: sfp: Fix unregistering of HWMON SFP device

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Date:   Tue, 25 Sep 2018 01:50:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: [PATCH v2 net] net: phy: sfp: Fix unregistering of HWMON SFP device

A HWMON device is only registered is the SFP module supports the
diagnostic page and is complient to SFF8472. Don't unconditionally
unregister the hwmon device when the SFP module is remove, otherwise
we access data structures which don't exist.

Reported-by: Florian Fainelli <f.fainelli@...il.com>
Fixes: 1323061a018a ("net: phy: sfp: Add HWMON support for module sensors")
Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/phy/sfp.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 52fffb98fde9..6e13b8832bc7 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -1098,8 +1098,11 @@ static int sfp_hwmon_insert(struct sfp *sfp)
 
 static void sfp_hwmon_remove(struct sfp *sfp)
 {
-	hwmon_device_unregister(sfp->hwmon_dev);
-	kfree(sfp->hwmon_name);
+	if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
+		hwmon_device_unregister(sfp->hwmon_dev);
+		sfp->hwmon_dev = NULL;
+		kfree(sfp->hwmon_name);
+	}
 }
 #else
 static int sfp_hwmon_insert(struct sfp *sfp)
-- 
2.19.0.rc1