[Intel-wired-lan] [RESEND PATCH] intel-ethernet: warn when fatal read failure happens

[Jeff Kirsher]

On Thu, 2019-05-23 at 11:22 +0800, Feng Tang wrote:
> Failed in reading the HW register is very serious for igb/igc driver,
> as its hw_addr will be set to NULL and cause the adapter be seen as
> "REMOVED".
> 
> We saw the error only a few times in the MTBF test for
> suspend/resume,
> but can hardly get any useful info to debug.
> 
> Adding WARN() so that we can get the necessary information about
> where and how it happens, and use it for root causing and fixing
> this "PCIe link lost issue"
> 
> This affects igb, igc.
> 
> Signed-off-by: Feng Tang <feng.tang at intel.com>
> Tested-by: Aaron Brown <aaron.f.brown at intel.com>
> Acked-by: Sasha Neftin <sasha.neftin at intel.com>
> ---
>  drivers/net/ethernet/intel/igb/igb_main.c | 1 +
>  drivers/net/ethernet/intel/igc/igc_main.c | 1 +
>  2 files changed, 2 insertions(+)

This patch is already in my next series of 1GbE patches to push to
Dave, so you can expect this to be pushed upstream before the weekend.
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