net: sfp: fix high power modules without diag mode

Commit 7cfa9c92d0a3 ("net: sfp: avoid power switch on address-change
modules") changed semantics for high power modules without diag mode.
We repeatedly try to read the current power status from the non-
existing 0x51 address, in the futile hope this failure is temporary:

[    8.856051] sfp sfp-eth3: module NTT              0000000000000000 rev 0000 sn 0000000000000000 dc 160408
[    8.865843] mvpp2 f4000000.ethernet eth3: switched to inband/1000base-x link mode
[    8.873469] sfp sfp-eth3: Failed to read EEPROM: -5
[    8.983251] sfp sfp-eth3: Failed to read EEPROM: -5
[    9.103250] sfp sfp-eth3: Failed to read EEPROM: -5

Previously we assumed such modules were powered up in the correct mode,
continuing without further configuration as long as the required power
class was supported by the host.

Restore this behaviour by detecting the lack of diagnostic address
support prior to setting the module power or checking for the address
change sequence.

Fixes: 7cfa9c92d0a3 ("net: sfp: avoid power switch on address-change modules")
Reported-by: 照山周一郎 <teruyama@springboard-inc.jp>
Reported-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

0 files changed, 0 insertions, 0 deletions