cciss: disable DMA refetch on Smart Array P600
authorMike Miller (OS Dev) <mikem@beardog.cca.cpqcorp.net>
Wed, 17 Oct 2007 08:10:04 +0000 (10:10 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Wed, 17 Oct 2007 08:10:04 +0000 (10:10 +0200)
commit8bf50f71cbfc7d043f0f135da72b3feefeaa0eb8
tree0472a163acf62a47bd45ec16ab698dd63648cdeb
parent9e91fdb32d449a6b57f8236a793ae2f3df79b4d8
cciss: disable DMA refetch on Smart Array P600

This patch disables DMA refetch in the PCI bridge. We have disabled DMA
prefetch for quite some time. Testing with XEN revealed another ASIC bug. If
dom0 resides on a P600 the board can can an MCA bi accessing invalid memory
addresses. Apparently, we need to disable both prefetch and refetch.
My understanding is a refetch operation should not occur but it is a valid
thing to do if prefetched data is no longer available for whatever reason.
Please consider this patch for inclusion.

Signed-off-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
--------------------------------------------------------------------------------
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
drivers/block/cciss.c