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[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>
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2 changed files with 25 additions and 0 deletions
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@ -632,6 +632,7 @@ typedef struct _MPT_ADAPTER
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struct mutex sas_discovery_mutex;
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u8 sas_discovery_runtime;
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u8 sas_discovery_ignore_events;
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u16 handle;
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int sas_index; /* index refrencing */
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MPT_SAS_MGMT sas_mgmt;
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int num_ports;
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@ -1635,8 +1635,10 @@ static int mptsas_probe_one_phy(struct device *dev,
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if (!mptsas_get_rphy(phy_info) && port && !port->rphy) {
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struct sas_rphy *rphy;
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struct device *parent;
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struct sas_identify identify;
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parent = dev->parent->parent;
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/*
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* Let the hotplug_work thread handle processing
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* the adding/removing of devices that occur
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@ -1647,6 +1649,27 @@ static int mptsas_probe_one_phy(struct device *dev,
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goto out;
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mptsas_parse_device_info(&identify, &phy_info->attached);
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if (scsi_is_host_device(parent)) {
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struct mptsas_portinfo *port_info;
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int i;
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mutex_lock(&ioc->sas_topology_mutex);
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port_info = mptsas_find_portinfo_by_handle(ioc,
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ioc->handle);
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mutex_unlock(&ioc->sas_topology_mutex);
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for (i = 0; i < port_info->num_phys; i++)
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if (port_info->phy_info[i].identify.sas_address ==
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identify.sas_address)
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goto out;
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} else if (scsi_is_sas_rphy(parent)) {
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struct sas_rphy *parent_rphy = dev_to_rphy(parent);
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if (identify.sas_address ==
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parent_rphy->identify.sas_address)
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goto out;
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}
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switch (identify.device_type) {
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case SAS_END_DEVICE:
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rphy = sas_end_device_alloc(port);
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@ -1698,6 +1721,7 @@ mptsas_probe_hba_phys(MPT_ADAPTER *ioc)
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goto out_free_port_info;
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mutex_lock(&ioc->sas_topology_mutex);
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ioc->handle = hba->handle;
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port_info = mptsas_find_portinfo_by_handle(ioc, hba->handle);
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if (!port_info) {
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port_info = hba;
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