Hi,
I'm using Intel IGB I350 NIC card on one of our arm based platforms.
While suspending the system, sometimes we see "igb 0000:01:00.0 eth1: PCIe
link lost, device now detached" print in the log and subsequent resume
causes system to crash. After digging the code (BTW, I'm using kernel-3.18
release), it looks like the above print comes because of the following call
flow, which got executed after igb_suspend() is called ( I confirmed this
with the help of prints)
[10846.434381] [<ffffffc000089ce4>] dump_backtrace+0x0/0xf8
[10846.434386] [<ffffffc000089ea0>] show_stack+0x10/0x1c
[10846.434393] [<ffffffc000bc3b70>] dump_stack+0x80/0xc4
[10846.434397] [<ffffffc000613d3c>] igb_rd32+0xb0/0x1a8
[10846.434400] [<ffffffc00062eb0c>] igb_ptp_read_82580+0x18/0x48
[10846.434407] [<ffffffc000106e6c>] timecounter_read+0x1c/0x60
[10846.434410] [<ffffffc00062f338>] igb_ptp_gettime_82576+0x2c/0x88
[10846.434413] [<ffffffc00062f41c>] igb_ptp_overflow_check+0x1c/0x58
[10846.434419] [<ffffffc0000ba584>] process_one_work+0x154/0x414
[10846.434424] [<ffffffc0000bb338>] worker_thread+0x13c/0x4e4
[10846.434428] [<ffffffc0000bfc4c>] kthread+0xf8/0x110
It looks like reading timer registers would have returned all F's as the
device is already in D3Hot state.
Is my understanding correct. Is there any patch available to fix this issue?
Let me know if more information is needed.
Thanks,
Vidya Sagar
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