diff options
| author | Jeff Skirvin <jeffrey.d.skirvin@intel.com> | 2011-11-16 09:44:13 +0000 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-02-19 14:22:49 -0600 |
| commit | 89d3cf6ac3cdc4f15a82709f8c78ed169a98be5b (patch) | |
| tree | 6da0cf7d0f6e0ff10890f456e754aa6f76013452 | |
| parent | 1f4fe89c9c78d3163cf1e389bdc6438a44b64244 (diff) | |
[SCSI] libsas: add mutex for SMP task execution
SAS does not tag SMP requests, and at least one lldd (isci) does not permit
more than one in-flight request at a time.
[jejb: fix sas_init_dev tab issues while we're at it]
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
| -rw-r--r-- | drivers/scsi/libsas/sas_discover.c | 31 | ||||
| -rw-r--r-- | drivers/scsi/libsas/sas_expander.c | 29 | ||||
| -rw-r--r-- | include/scsi/libsas.h | 2 |
3 files changed, 34 insertions, 28 deletions
diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c index bad5eba4a92b..c56cc6400819 100644 --- a/drivers/scsi/libsas/sas_discover.c +++ b/drivers/scsi/libsas/sas_discover.c @@ -37,21 +37,22 @@ void sas_init_dev(struct domain_device *dev) { - switch (dev->dev_type) { - case SAS_END_DEV: - break; - case EDGE_DEV: - case FANOUT_DEV: - INIT_LIST_HEAD(&dev->ex_dev.children); - break; - case SATA_DEV: - case SATA_PM: - case SATA_PM_PORT: - INIT_LIST_HEAD(&dev->sata_dev.children); - break; - default: - break; - } + switch (dev->dev_type) { + case SAS_END_DEV: + break; + case EDGE_DEV: + case FANOUT_DEV: + INIT_LIST_HEAD(&dev->ex_dev.children); + mutex_init(&dev->ex_dev.cmd_mutex); + break; + case SATA_DEV: + case SATA_PM: + case SATA_PM_PORT: + INIT_LIST_HEAD(&dev->sata_dev.children); + break; + default: + break; + } } /* ---------- Domain device discovery ---------- */ diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index d3c1a29b8a2a..7c59f97c0287 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -72,11 +72,13 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size, struct sas_internal *i = to_sas_internal(dev->port->ha->core.shost->transportt); + mutex_lock(&dev->ex_dev.cmd_mutex); for (retry = 0; retry < 3; retry++) { task = sas_alloc_task(GFP_KERNEL); - if (!task) - return -ENOMEM; - + if (!task) { + res = -ENOMEM; + break; + } task->dev = dev; task->task_proto = dev->tproto; sg_init_one(&task->smp_task.smp_req, req, req_size); @@ -94,7 +96,7 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size, if (res) { del_timer(&task->timer); SAS_DPRINTK("executing SMP task failed:%d\n", res); - goto ex_err; + break; } wait_for_completion(&task->completion); @@ -104,21 +106,23 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size, i->dft->lldd_abort_task(task); if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { SAS_DPRINTK("SMP task aborted and not done\n"); - goto ex_err; + break; } } if (task->task_status.resp == SAS_TASK_COMPLETE && task->task_status.stat == SAM_STAT_GOOD) { res = 0; break; - } if (task->task_status.resp == SAS_TASK_COMPLETE && - task->task_status.stat == SAS_DATA_UNDERRUN) { + } + if (task->task_status.resp == SAS_TASK_COMPLETE && + task->task_status.stat == SAS_DATA_UNDERRUN) { /* no error, but return the number of bytes of * underrun */ res = task->task_status.residual; break; - } if (task->task_status.resp == SAS_TASK_COMPLETE && - task->task_status.stat == SAS_DATA_OVERRUN) { + } + if (task->task_status.resp == SAS_TASK_COMPLETE && + task->task_status.stat == SAS_DATA_OVERRUN) { res = -EMSGSIZE; break; } else { @@ -131,11 +135,10 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size, task = NULL; } } -ex_err: + mutex_unlock(&dev->ex_dev.cmd_mutex); + BUG_ON(retry == 3 && task != NULL); - if (task != NULL) { - sas_free_task(task); - } + sas_free_task(task); return res; } diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h index f388ba536128..18704a2e4f07 100644 --- a/include/scsi/libsas.h +++ b/include/scsi/libsas.h @@ -153,6 +153,8 @@ struct expander_device { struct ex_phy *ex_phy; struct sas_port *parent_port; + + struct mutex cmd_mutex; }; /* ---------- SATA device ---------- */ |