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Subject[PATCH 4.15 35/84] sfp: fix EEPROM reading in the case of non-SFF8472 SFPs
Date
4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

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


[ Upstream commit 2794ffc441dde3109804085dc745e8014a4de224 ]

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@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/phy/sfp.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -683,20 +683,19 @@ static int sfp_module_eeprom(struct sfp
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;
}

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