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authorDan Williams <dan.j.williams@intel.com>2012-06-21 23:25:27 -0700
committerJames Bottomley <JBottomley@Parallels.com>2012-07-20 08:58:45 +0100
commite4a9c3732cea3e3c8c704aad86636090ffe6b25f (patch)
treefaea8e91b3d917dcdb4c89adbb021ac737a6cb35 /include/scsi/libsas.h
parent3b661a92e869ebe2358de8f4b3230ad84f7fce51 (diff)
downloadlinux-e4a9c3732cea3e3c8c704aad86636090ffe6b25f.tar.bz2
[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>
Diffstat (limited to 'include/scsi/libsas.h')
-rw-r--r--include/scsi/libsas.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 10ce74f589c5..814d8cb592ad 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -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;