diff options
| -rw-r--r-- | drivers/scsi/libsas/sas_expander.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index 76555b1ddfd5..8aeaad95242c 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -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; } |