tree 314aa36e4941a7db9c446da103379c530c9d785b
parent 562aa1d4c6a874373f9a48ac184f662fbbb06a04
author Alan <alan@lxorguk.ukuu.org.uk> 1172770606 +0000
committer Jeff Garzik <jeff@garzik.org> 1172875368 -0500

libata-core: Fix simplex handling

The initial simplex handling code is fooled if you suspend and resume.
This also causes problems with some single channel controllers which
claim to be simplex.

The fix is fairly simple, instead of keeping a flag to remember if we
gave away the simplex channel we remember the actual owner. As the owner
is always part of the host_set we don't even need a refcount.

Knowing the owner also means we can reassign simplex DMA channels in
future hotplug code etc if we need to

Signed-off-by: Alan Cox <alan@redhat.com>
(and a signed-off for the patch I sent before while I remember)
Signed-off-by: Jeff Garzik <jeff@garzik.org>