[SCSI] libsas: Don't BUG when connecting two expanders via wide port

libsas: Don't BUG when connecting two expanders via wide port

When a device is connected to an expander, the discovery process goes through
sas_ex_discover_dev to figure out what's attached to the phy.  If it is the
case that the phy being discovered happens to be the second phy of a wide link
to an expander, that discover_dev function will incorrectly call
sas_ex_discover_expander, which creates another sas_port and tries to attach the
other sas_phys to the new port, thus triggering a BUG.  The correct thing to do is
to check the other ex_phys of the expander to see if there's a sas_port for this
sas_phy, and attach the sas_phy to the existing sas_port.

This is easily triggered if one enables the phys of a wide port between
expanders one by one.

This second version of the patch fixes a small regression in the case where
all the phys show up at once and we accidentally try to attach to a port
that hasn't been created yet.

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

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index d9b9a008d36d..dc70c180e115 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -678,6 +678,29 @@ static struct domain_device *sas_ex_discover_end_dev(
         return NULL;
 }
 
+/* See if this phy is part of a wide port */
+static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
+{
+        struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
+        int i;
+
+        for (i = 0; i < parent->ex_dev.num_phys; i++) {
+                struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
+
+                if (ephy == phy)
+                        continue;
+
+                if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
+                            SAS_ADDR_SIZE) && ephy->port) {
+                        sas_port_add_phy(ephy->port, phy->phy);
+                        phy->phy_state = PHY_DEVICE_DISCOVERED;
+                        return 0;
+                }
+        }
+
+        return -ENODEV;
+}
+
 static struct domain_device *sas_ex_discover_expander(
         struct domain_device *parent, int phy_id)
 {
@@ -810,6 +833,13 @@ static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
                 return res;
         }
 
+        res = sas_ex_join_wide_port(dev, phy_id);
+        if (!res) {
+                SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
+                            phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
+                return res;
+        }
+
         switch (ex_phy->attached_dev_type) {
         case SAS_END_DEV:
                 child = sas_ex_discover_end_dev(dev, phy_id);