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[SCSI] aic94xx SCSI timeout fix: SMP retry fix. 

Updating DDB0 inside aic94xx driver itself caused SMP command timeout. I
hit this SMP timeout problem twice but I am not able to reproduce it since
then. Here is a fix that retries an SMP command.

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
malahal@us.ibm.com 2006-10-04 17:34:03 -07:00 committed by James Bottomley
parent 3f048109d9
commit 42961ee8fc
1 changed files with 47 additions and 37 deletions
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84
drivers/scsi/libsas/sas_expander.c
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@ -71,55 +71,65 @@ static void smp_task_done(struct sas_task *task)
static int smp_execute_task(struct domain_device *dev, void *req, int req_size, static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
void *resp, int resp_size) void *resp, int resp_size)
{ {
int res; int res, retry;
struct sas_task *task = sas_alloc_task(GFP_KERNEL); struct sas_task *task = NULL;
struct sas_internal *i = struct sas_internal *i =
to_sas_internal(dev->port->ha->core.shost->transportt); to_sas_internal(dev->port->ha->core.shost->transportt);
if (!task) for (retry = 0; retry < 3; retry++) {
return -ENOMEM; task = sas_alloc_task(GFP_KERNEL);
if (!task)
return -ENOMEM;
task->dev = dev; task->dev = dev;
task->task_proto = dev->tproto; task->task_proto = dev->tproto;
sg_init_one(&task->smp_task.smp_req, req, req_size); sg_init_one(&task->smp_task.smp_req, req, req_size);
sg_init_one(&task->smp_task.smp_resp, resp, resp_size); sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
task->task_done = smp_task_done; task->task_done = smp_task_done;
task->timer.data = (unsigned long) task; task->timer.data = (unsigned long) task;
task->timer.function = smp_task_timedout; task->timer.function = smp_task_timedout;
task->timer.expires = jiffies + SMP_TIMEOUT*HZ; task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
add_timer(&task->timer); add_timer(&task->timer);
res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL); res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
if (res) { if (res) {
del_timer(&task->timer); del_timer(&task->timer);
SAS_DPRINTK("executing SMP task failed:%d\n", res); SAS_DPRINTK("executing SMP task failed:%d\n", res);
goto ex_err;
}
wait_for_completion(&task->completion);
res = -ETASK;
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
SAS_DPRINTK("smp task timed out or aborted\n");
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; goto ex_err;
} }
wait_for_completion(&task->completion);
res = -ETASK;
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
SAS_DPRINTK("smp task timed out or aborted\n");
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;
}
}
if (task->task_status.resp == SAS_TASK_COMPLETE &&
task->task_status.stat == SAM_GOOD) {
res = 0;
break;
} else {
SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
"status 0x%x\n", __FUNCTION__,
SAS_ADDR(dev->sas_addr),
task->task_status.resp,
task->task_status.stat);
sas_free_task(task);
task = NULL;
}
} }
if (task->task_status.resp == SAS_TASK_COMPLETE &&
task->task_status.stat == SAM_GOOD)
res = 0;
else
SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
"status 0x%x\n", __FUNCTION__,
SAS_ADDR(dev->sas_addr),
task->task_status.resp,
task->task_status.stat);
ex_err: ex_err:
sas_free_task(task); BUG_ON(retry == 3 && task != NULL);
if (task != NULL) {
sas_free_task(task);
}
return res; return res;
} }