[SCSI] libsas: abstract STP task status into a function

[linux-2.6-omap-h63xx.git] / drivers / scsi / libsas / sas_expander.c

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 8727436b222d340f269556d2b7054a31416700c6..aefd865a578862e3bf17b4a8d6a7f8a4a8aaffef 100644 (file)
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -96,7 +96,7 @@ static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
                }
 
                wait_for_completion(&task->completion);
-               res = -ETASK;
+               res = -ECOMM;
                if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
                        SAS_DPRINTK("smp task timed out or aborted\n");
                        i->dft->lldd_abort_task(task);
@@ -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__,
@@ -656,9 +666,9 @@ static struct domain_device *sas_ex_discover_end_dev(
        sas_ex_get_linkrate(parent, child, phy);
 
 #ifdef CONFIG_SCSI_SAS_ATA
-       if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
+       if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
                child->dev_type = SATA_DEV;
-               if (phy->attached_tproto & SAS_PROTO_STP)
+               if (phy->attached_tproto & SAS_PROTOCOL_STP)
                        child->tproto = phy->attached_tproto;
                if (phy->attached_sata_dev)
                        child->tproto |= SATA_DEV;
@@ -695,7 +705,7 @@ static struct domain_device *sas_ex_discover_end_dev(
                }
        } else
 #endif
-         if (phy->attached_tproto & SAS_PROTO_SSP) {
+         if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
                child->dev_type = SAS_END_DEV;
                rphy = sas_end_device_alloc(phy->port);
                /* FIXME: error handling */
@@ -1896,11 +1906,9 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
        }
 
        /* no rphy means no smp target support (ie aic94xx host) */
-       if (!rphy) {
-               printk("%s: can we send a smp request to a host?\n",
-                      __FUNCTION__);
-               return -EINVAL;
-       }
+       if (!rphy)
+               return sas_smp_host_handler(shost, req, rsp);
+
        type = rphy->identify.device_type;
 
        if (type != SAS_EDGE_EXPANDER_DEVICE &&
@@ -1926,6 +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;
 }