iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

5
include/scsi/sas_ata.h
View File

@ -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_ */