[Intel-wired-lan] [PATCH] igb: add more checks for disconnected adapter

[Mark Rustad <mrustad@gmail.com>]

On 9/21/15 9:14 PM, Jarod Wilson wrote:
> Just switching to adapter->io_addr everywhere seems to not work as 
> noted above. :\ Note that I'm also chasing this from the other end 
> with the author of the pci patches that seem to have triggered this, 
> so the real bug might be over in pci-land, but hardening against 
> explosions in igb still seems like a worthwhile effort here.

My understanding is that there can be problems if too many writes to a
removed device happen. That is why ixgbe avoids doing that by testing
for removal in some places. The io_addr does get used in the transmit
path simply to avoid adding a test to that hot path. That approach
seems to be working well for ixgbe.

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