[SCSI] mptsas: eliminate ghost devices

One of the current problems the mptsas driver has is that of "ghost"
devices (these are devices the firmware reports as existing, but what
they actually represent are the parents of a lower device), so for
example in my dual expander configuration, three expanders actually show
up, two for the real expanders but a third is created because the
firmware reports that the lower expander also has another expander
connected (which is simply the port going back to the upper expander).

The attached patch eliminates all these ghosts by not allocating any
devices for them if the SAS address is the SAS address of the parent.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/drivers/message/fusion/mptbase.h b/drivers/message/fusion/mptbase.h
index 7bf0855f9349..2697b70653f2 100644
--- a/drivers/message/fusion/mptbase.h
+++ b/drivers/message/fusion/mptbase.h
@@ -632,6 +632,7 @@ typedef struct _MPT_ADAPTER
         struct mutex             sas_discovery_mutex;
         u8                       sas_discovery_runtime;
         u8                       sas_discovery_ignore_events;
+        u16                      handle;
         int                      sas_index; /* index refrencing */
         MPT_SAS_MGMT             sas_mgmt;
         int                      num_ports;
diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index 85eff1509d66..f7bd8b11ed3b 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -1635,8 +1635,10 @@ static int mptsas_probe_one_phy(struct device *dev,
         if (!mptsas_get_rphy(phy_info) && port && !port->rphy) {
 
                 struct sas_rphy *rphy;
+                struct device *parent;
                 struct sas_identify identify;
 
+                parent = dev->parent->parent;
                 /*
                  * Let the hotplug_work thread handle processing
                  * the adding/removing of devices that occur
@@ -1647,6 +1649,27 @@ static int mptsas_probe_one_phy(struct device *dev,
                                 goto out;
 
                 mptsas_parse_device_info(&identify, &phy_info->attached);
+                if (scsi_is_host_device(parent)) {
+                        struct mptsas_portinfo *port_info;
+                        int i;
+
+                        mutex_lock(&ioc->sas_topology_mutex);
+                        port_info = mptsas_find_portinfo_by_handle(ioc,
+                                                                   ioc->handle);
+                        mutex_unlock(&ioc->sas_topology_mutex);
+
+                        for (i = 0; i < port_info->num_phys; i++)
+                                if (port_info->phy_info[i].identify.sas_address ==
+                                    identify.sas_address)
+                                        goto out;
+
+                } else if (scsi_is_sas_rphy(parent)) {
+                        struct sas_rphy *parent_rphy = dev_to_rphy(parent);
+                        if (identify.sas_address ==
+                            parent_rphy->identify.sas_address)
+                                goto out;
+                }
+
                 switch (identify.device_type) {
                 case SAS_END_DEVICE:
                         rphy = sas_end_device_alloc(port);
@@ -1698,6 +1721,7 @@ mptsas_probe_hba_phys(MPT_ADAPTER *ioc)
                 goto out_free_port_info;
 
         mutex_lock(&ioc->sas_topology_mutex);
+        ioc->handle = hba->handle;
         port_info = mptsas_find_portinfo_by_handle(ioc, hba->handle);
         if (!port_info) {
                 port_info = hba;