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

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Date:	Mon, 21 Sep 2015 22:03:42 -0700
From:	Mark Rustad <mrustad@...il.com>
To:	Jarod Wilson <jarod@...hat.com>,
	Alexander Duyck <alexander.duyck@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org
Subject: Re: [Intel-wired-lan] [PATCH] igb: add more checks for disconnected
 adapter

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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