[SCSI] libata, libsas: introduce sched_eh and end_eh port ops
authorDan Williams <dan.j.williams@intel.com>
Fri, 22 Jun 2012 06:25:27 +0000 (23:25 -0700)
committerJames Bottomley <JBottomley@Parallels.com>
Fri, 20 Jul 2012 07:58:45 +0000 (08:58 +0100)
commite4a9c3732cea3e3c8c704aad86636090ffe6b25f
treefaea8e91b3d917dcdb4c89adbb021ac737a6cb35
parent3b661a92e869ebe2358de8f4b3230ad84f7fce51
[SCSI] libata, libsas: introduce sched_eh and end_eh port ops

When managing shost->host_eh_scheduled libata assumes that there is a
1:1 shost-to-ata_port relationship.  libsas creates a 1:N relationship
so it needs to manage host_eh_scheduled cumulatively at the host level.
The sched_eh and end_eh port port ops allow libsas to track when domain
devices enter/leave the "eh-pending" state under ha->lock (previously
named ha->state_lock, but it is no longer just a lock for ha->state
changes).

Since host_eh_scheduled indicates eh without backing commands pinning
the device it can be deallocated at any time.  Move the taking of the
domain_device reference under the port_lock to guarantee that the
ata_port stays around for the duration of eh.

Reviewed-by: Jacek Danecki <jacek.danecki@intel.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
drivers/ata/libata-core.c
drivers/ata/libata-eh.c
drivers/scsi/libsas/sas_ata.c
drivers/scsi/libsas/sas_discover.c
drivers/scsi/libsas/sas_event.c
drivers/scsi/libsas/sas_init.c
drivers/scsi/libsas/sas_scsi_host.c
include/linux/libata.h
include/scsi/libsas.h
include/scsi/sas_ata.h