libata-core: Fix simplex handling
authorAlan <alan@lxorguk.ukuu.org.uk>
Thu, 1 Mar 2007 17:36:46 +0000 (17:36 +0000)
committerJeff Garzik <jeff@garzik.org>
Fri, 2 Mar 2007 22:42:48 +0000 (17:42 -0500)
commit032af1ce16d496b825adde0fa03948785ee16830
tree314aa36e4941a7db9c446da103379c530c9d785b
parent562aa1d4c6a874373f9a48ac184f662fbbb06a04
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>
drivers/ata/libata-core.c
include/linux/libata.h