Comment 2 for bug 1291113

I emailed Dan Williams, igb driver maintainer, and he pointed me at this commit. Said it had not been picked up in the 3.11 tree to his knowledge, but was in other 3.1x trees:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/dma/ioat?id=da87ca4d4ca101f177fffd84f1f0a5e4c0343557