tree eb70ae0b28d7164510a4a9e78444cc7f81616490
parent e04b0ea2e0f9c1bb0d874db4493fc7f7a623116b
author Brian King <brking@us.ibm.com> 1127809316 -0700
committer Greg Kroah-Hartman <gregkh@suse.de> 1130539018 -0700

[PATCH] PCI: ipr: Block config access during BIST

IPR scsi adapter have an exposure today in that they issue BIST to the adapter
to reset the card.  If, during the time it takes to complete BIST, userspace
attempts to access PCI config space, the host bus bridge will master abort the
access since the ipr adapter does not respond on the PCI bus for a brief
period of time when running BIST.  On PPC64 hardware, this master abort
results in the host PCI bridge isolating that PCI device from the rest of the
system, making the device unusable until Linux is rebooted.  This patch makes
use of some newly added PCI layer APIs that allow for protection from
userspace accessing config space of a device in scenarios such as this.

Signed-off-by: Brian King <brking@us.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

 drivers/scsi/ipr.c |    2 ++
 1 file changed, 2 insertions(+)