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| author | Dan Williams <dan.j.williams@intel.com> | 2012-06-21 23:25:27 -0700 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-07-20 08:58:45 +0100 |
| commit | e4a9c3732cea3e3c8c704aad86636090ffe6b25f (patch) | |
| tree | faea8e91b3d917dcdb4c89adbb021ac737a6cb35 /include/scsi | |
| parent | 3b661a92e869ebe2358de8f4b3230ad84f7fce51 (diff) | |
| download | linux-e4a9c3732cea3e3c8c704aad86636090ffe6b25f.tar.gz linux-e4a9c3732cea3e3c8c704aad86636090ffe6b25f.tar.bz2 linux-e4a9c3732cea3e3c8c704aad86636090ffe6b25f.zip | |
[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')
| -rw-r--r-- | include/scsi/libsas.h | 4 | ||||
| -rw-r--r-- | include/scsi/sas_ata.h | 5 |
2 files changed, 8 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; diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h index 77670e823ed8..2dfbdaa0b34a 100644 --- a/include/scsi/sas_ata.h +++ b/include/scsi/sas_ata.h @@ -45,6 +45,7 @@ void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, void sas_ata_schedule_reset(struct domain_device *dev); void sas_ata_wait_eh(struct domain_device *dev); void sas_probe_sata(struct asd_sas_port *port); +void sas_ata_end_eh(struct ata_port *ap); #else @@ -85,6 +86,10 @@ static inline int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy { return 0; } + +static inline void sas_ata_end_eh(struct ata_port *ap) +{ +} #endif #endif /* _SAS_ATA_H_ */ |