[SRU] [F/Unstable/OEM-OSP1-B/OEM-5.6] [PATCH 0/1] Fix incorrect speed/duplex when I210 device is runtime suspended

[Kai-Heng Feng]

BugLink: https://bugs.launchpad.net/bugs/1880656

[Impact]
When I210 device is runtime suspended, trying to read speed or duplex from
sysfs causes an error:
[ 385.991957] igb 0000:03:00.0 enp3s0: PCIe link lost

[Fix]
Only try to read the device register when it's not runtime suspended.

[Test]
Without the fix:
$ cat /sys/class/net/enp3s0/speed
1000

With the fix:
$ cat /sys/class/net/enp3s0/speed
-1

-1 means "unknown speed", which is the correct status when device is runtime
suspend.

[Regression Potential]
Low. It's a trivial fix which limits to one driver.

Kai-Heng Feng (1):
  igb: Report speed and duplex as unknown when device is runtime
    suspended

 drivers/net/ethernet/intel/igb/igb_ethtool.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
2.17.1