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[SCSI] libata, libsas: introduce sched_eh and end_eh port ops

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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>
This commit is contained in:
Dan Williams 2012-06-21 23:25:27 -07:00 • committed by James Bottomley
parent 3b661a92e8
commit e4a9c3732c
10 changed files with 136 additions and 39 deletions
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4
include/scsi/libsas.h
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@ -179,6 +179,7 @@ struct sata_device {
enum {
SAS_DEV_GONE,
SAS_DEV_DESTROY,
SAS_DEV_EH_PENDING,
};
struct domain_device {
@ -386,7 +387,8 @@ struct sas_ha_struct {
struct list_head defer_q; /* work queued while draining */
struct mutex drain_mutex;
unsigned long state;
spinlock_t state_lock;
spinlock_t lock;
int eh_active;
struct mutex disco_mutex;