tree 9e25256c54df4dfe7664e7bd6c45b55f99cfea66
parent 4d1f9082251a835ea387b47bb9dd26980bf8e0d0
author Tejun Heo <tj@kernel.org> 1279635601 +0200
committer Jeff Garzik <jgarzik@redhat.com> 1280706399 -0400

ata_piix: fix locking around SIDPR access

SIDPR window registers are shared across ports and as each access is
done in two steps, accesses to different ports under EH may race.
This primarily is caused by incorrect host locking in EH context and
should be fixed by defining locking requirements for each EH operation
which can be used during EH and enforcing them but for now work around
the problem by adding a dedicated SIDPR lock and grabbing it for each
SIDPR access.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Mark Knecht <markknecht@gmail.com>
Reported-by: Paul Check <paul@thechecks.ca>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>