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Subject[PATCH 02/15] libsas: Clean up rphys/port dev list after a discovery error.
Date

sas_get_port_device assigns a rphy to a domain device in anticipation
of finding a disk. When a discovery error occurs in
sas_discover_{sata,sas,expander}*, however, we need to clean up that
rphy and the port device list so that we don't GPF. In addition, we
need to check the result of the second sas_notify_lldd_dev_found.
This patch seems ok on a x260, x366 and x206m.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---

drivers/scsi/libsas/sas_discover.c | 40 ++++++++++++++++++++++++++++++------
drivers/scsi/libsas/sas_expander.c | 20 ++++++++++++++----
2 files changed, 49 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index 9e4fd2a..758b153 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -552,7 +552,7 @@ int sas_discover_sata(struct domain_devi

res = sas_notify_lldd_dev_found(dev);
if (res)
- return res;
+ goto out_err2;

switch (dev->dev_type) {
case SATA_DEV:
@@ -564,12 +564,25 @@ int sas_discover_sata(struct domain_devi
default:
break;
}
+ if (res)
+ goto out_err;

sas_notify_lldd_dev_gone(dev);
- if (!res) {
- sas_notify_lldd_dev_found(dev);
- res = sas_rphy_add(dev->rphy);
- }
+ 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;
+
+out_err:
+ sas_notify_lldd_dev_gone(dev);
+out_err2:
+ sas_rphy_free(dev->rphy);
+ dev->rphy = NULL;
return res;
}

@@ -585,7 +598,7 @@ int sas_discover_end_dev(struct domain_d

res = sas_notify_lldd_dev_found(dev);
if (res)
- return res;
+ goto out_err2;

res = sas_rphy_add(dev->rphy);
if (res)
@@ -594,12 +607,21 @@ int sas_discover_end_dev(struct domain_d
/* do this to get the end device port attributes which will have
* been scanned in sas_rphy_add */
sas_notify_lldd_dev_gone(dev);
- sas_notify_lldd_dev_found(dev);
+ res = sas_notify_lldd_dev_found(dev);
+ if (res)
+ goto out_err3;

return 0;

out_err:
sas_notify_lldd_dev_gone(dev);
+out_err2:
+ sas_rphy_free(dev->rphy);
+ dev->rphy = NULL;
+ return res;
+out_err3:
+ sas_rphy_delete(dev->rphy);
+ dev->rphy = NULL;
return res;
}

@@ -689,6 +711,10 @@ static void sas_discover_domain(void *da
}

if (error) {
+ spin_lock(&port->dev_list_lock);
+ list_del_init(&port->port_dev->dev_list_node);
+ spin_unlock(&port->dev_list_lock);
+
kfree(port->port_dev); /* not kobject_register-ed yet */
port->port_dev = NULL;
}
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 4cc7457..a38d05b 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -711,7 +711,6 @@ static struct domain_device *sas_ex_disc

out_list_del:
list_del(&child->dev_list_node);
- sas_rphy_free(rphy);
out_free:
sas_port_delete(phy->port);
out_err:
@@ -1474,14 +1473,27 @@ int sas_discover_root_expander(struct do
int res;
struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);

- sas_rphy_add(dev->rphy);
+ res = sas_rphy_add(dev->rphy);
+ if (res)
+ goto out_err;

ex->level = dev->port->disc.max_level; /* 0 */
res = sas_discover_expander(dev);
- if (!res)
- sas_ex_bfs_disc(dev->port);
+ if (res)
+ goto out_err2;
+
+ sas_ex_bfs_disc(dev->port);

return res;
+
+out_err2:
+ sas_rphy_delete(dev->rphy);
+ dev->rphy = NULL;
+ return res;
+out_err:
+ sas_rphy_free(dev->rphy);
+ dev->rphy = NULL;
+ return res;
}

/* ---------- Domain revalidation ---------- */
-
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