netdev - [PATCH 2/3] sfp: fix EEPROM reading in the case of non-SFF8472 SFPs

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Date:   Fri, 15 Dec 2017 16:09:41 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH 2/3] sfp: fix EEPROM reading in the case of non-SFF8472 SFPs

The EEPROM reading was trying to read from the second EEPROM address
if we requested the last byte from the SFF8079 EEPROM, which caused a
failure when the second EEPROM is not present.  Discovered with a
S-RJ01 SFP module.  Fix this.

Fixes: 73970055450e ("sfp: add SFP module support")
Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/sfp.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 1a958c7b912d..ee6b2e041171 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -724,20 +724,19 @@ static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
 		len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
 		len -= first;
 
-		ret = sfp->read(sfp, false, first, data, len);
+		ret = sfp_read(sfp, false, first, data, len);
 		if (ret < 0)
 			return ret;
 
 		first += len;
 		data += len;
 	}
-	if (first >= ETH_MODULE_SFF_8079_LEN &&
-	    first < ETH_MODULE_SFF_8472_LEN) {
+	if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
 		len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
 		len -= first;
 		first -= ETH_MODULE_SFF_8079_LEN;
 
-		ret = sfp->read(sfp, true, first, data, len);
+		ret = sfp_read(sfp, true, first, data, len);
 		if (ret < 0)
 			return ret;
 	}
-- 
2.7.4