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[SCSI] libsas: restore scan order

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ata devices are always scanned after ssp.  Prior to the ata error
handling reworks libsas would tend to scan devices in ascending expander
phy order.  Restore this ordering by deferring ssp discovery to a
DISCE_PROBE event, and keep the probe order consistent with the
discovery order, not the placement of sata devices.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Dan Williams
2012-01-18 20:14:01 -08:00
committed by James Bottomley
parent c666aae691
commit 92625f9bff
4 changed files with 32 additions and 50 deletions
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44
drivers/scsi/libsas/sas_discover.c
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@@ -152,7 +152,7 @@ static int sas_get_port_device(struct asd_sas_port *port)
dev->rphy = rphy;
if (dev_is_sata(dev))
if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEV)
list_add_tail(&dev->disco_list_node, &port->disco_list);
else {
spin_lock_irq(&port->dev_list_lock);
@@ -198,8 +198,34 @@ void sas_notify_lldd_dev_gone(struct domain_device *dev)
}
}
/* ---------- Common/dispatchers ---------- */
static void sas_probe_devices(struct work_struct *work)
{
struct domain_device *dev, *n;
struct sas_discovery_event *ev =
container_of(work, struct sas_discovery_event, work);
struct asd_sas_port *port = ev->port;
clear_bit(DISCE_PROBE, &port->disc.pending);
list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
int err;
spin_lock_irq(&port->dev_list_lock);
list_add_tail(&dev->dev_list_node, &port->dev_list);
spin_unlock_irq(&port->dev_list_lock);
err = sas_rphy_add(dev->rphy);
if (err) {
SAS_DPRINTK("%s: for %s device %16llx returned %d\n",
__func__, dev->parent ? "exp-attached" :
"direct-attached",
SAS_ADDR(dev->sas_addr), err);
sas_unregister_dev(port, dev);
} else
list_del_init(&dev->disco_list_node);
}
}
/**
* sas_discover_end_dev -- discover an end device (SSP, etc)
@@ -213,18 +239,10 @@ int sas_discover_end_dev(struct domain_device *dev)
res = sas_notify_lldd_dev_found(dev);
if (res)
goto out_err2;
res = sas_rphy_add(dev->rphy);
if (res)
goto out_err;
return res;
sas_discover_event(dev->port, DISCE_PROBE);
return 0;
out_err:
sas_notify_lldd_dev_gone(dev);
out_err2:
return res;
}
/* ---------- Device registration and unregistration ---------- */
@@ -491,7 +509,7 @@ void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
[DISCE_PROBE] = sas_probe_sata,
[DISCE_PROBE] = sas_probe_devices,
[DISCE_DESTRUCT] = sas_destruct_devices,
};