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[SCSI] libsas: let libata handle command timeouts 

libsas-eh if it successfully aborts an ata command will hide the timeout
condition (AC_ERR_TIMEOUT) from libata.  The command likely completes
with the all-zero task->task_status it started with.  Instead, interpret
a TMF_RESP_FUNC_COMPLETE as the end of the sas_task but keep the scmd
around for libata-eh to handle.

Tested-by: Andrzej Jakowski <andrzej.jakowski@intel.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 2011-11-29 12:08:50 -08:00 committed by James Bottomley
parent 9095a64a9a
commit 3944f50995
3 changed files with 23 additions and 3 deletions
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1
drivers/scsi/libsas/sas_init.c
View File

@ -146,6 +146,7 @@ int sas_register_ha(struct sas_ha_struct *sas_ha)
}
INIT_LIST_HEAD(&sas_ha->eh_done_q);
INIT_LIST_HEAD(&sas_ha->eh_ata_q);
return 0;

22
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -265,6 +265,22 @@ static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
}
static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
{
struct sas_task *task = TO_SAS_TASK(cmd);
struct domain_device *dev = task->dev;
struct sas_ha_struct *ha = dev->port->ha;
if (!dev_is_sata(dev)) {
sas_eh_finish_cmd(cmd);
return;
}
/* report the timeout to libata */
sas_end_task(cmd, task);
list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
}
static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
{
struct scsi_cmnd *cmd, *n;
@ -562,12 +578,12 @@ Again:
case TASK_IS_DONE:
SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
task);
sas_eh_finish_cmd(cmd);
sas_eh_defer_cmd(cmd);
continue;
case TASK_IS_ABORTED:
SAS_DPRINTK("%s: task 0x%p is aborted\n",
__func__, task);
sas_eh_finish_cmd(cmd);
sas_eh_defer_cmd(cmd);
continue;
case TASK_IS_AT_LU:
SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
@ -635,12 +651,14 @@ Again:
goto clear_q;
}
}
list_splice_tail_init(&ha->eh_ata_q, work_q);
return list_empty(work_q);
clear_q:
SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
list_for_each_entry_safe(cmd, n, work_q, eh_entry)
sas_eh_finish_cmd(cmd);
list_splice_tail_init(&ha->eh_ata_q, work_q);
return list_empty(work_q);
}

3
include/scsi/libsas.h
View File

@ -382,7 +382,8 @@ struct sas_ha_struct {
void *lldd_ha; /* not touched by sas class code */
struct list_head eh_done_q;
struct list_head eh_done_q; /* complete via scsi_eh_flush_done_q */
struct list_head eh_ata_q; /* scmds to promote from sas to ata eh */
};
#define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)