Commit 2d4b63e1 authored by James Bottomley's avatar James Bottomley
Browse files

[SCSI] libsas: don't treat underrun as an error on SMP tasks



All SMP tasks sent through bsg generate messages like:

sas: smp_execute_task: task to dev 500605b000001450 response: 0x0 status 0x81

Three times (because the task gets retried).  Firstly, don't retry
either overrun or underrun (the data buffer isn't going to change size)
and secondly, just report the underrun but don't set an error for it.
This is necessary so bsg can report back the residual.
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent b98e66fa
......@@ -109,6 +109,16 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
task->task_status.stat == SAM_GOOD) {
res = 0;
break;
} 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) {
res = -EMSGSIZE;
break;
} else {
SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
"status 0x%x\n", __FUNCTION__,
......@@ -1924,6 +1934,15 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
bio_data(rsp->bio), rsp->data_len);
if (ret > 0) {
/* positive number is the untransferred residual */
rsp->data_len = ret;
req->data_len = 0;
ret = 0;
} else if (ret == 0) {
rsp->data_len = 0;
req->data_len = 0;
}
return ret;
}
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