[SCSI] libsas: fix ata_eh clobbering ex_phys via smp_ata_check_ready

The check_ready implementation in the expander-attached ata device case
polls on sas_ex_phy_discover().  The effect is that the ex_phy fields
(critically ->attached_sas_addr) can change.  When ata_eh ends and
libsas comes along to revalidate the domain
sas_unregister_devs_sas_addr() can fail to lookup devices to remove, or
fail to re-add an ata device that ata_eh marked as disabled.  So change
the code to skip the sas_address and change count updates when ata_eh is
active.

Cc: Jack Wang <jack_wang@usish.com>
Tested-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
Tested-by: Bartek Nowakowski <bartek.nowakowski@intel.com>
Tested-by: Jacek Danecki <jacek.danecki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 37c3c3f5f35d..c1f91b1c27c3 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -202,6 +202,7 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
         u8 sas_addr[SAS_ADDR_SIZE];
         struct smp_resp *resp = rsp;
         struct discover_resp *dr = &resp->disc;
+        struct sas_ha_struct *ha = dev->port->ha;
         struct expander_device *ex = &dev->ex_dev;
         struct ex_phy *phy = &ex->ex_phy[phy_id];
         struct sas_rphy *rphy = dev->rphy;
@@ -209,6 +210,8 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
         char *type;
 
         if (new_phy) {
+                if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))
+                        return;
                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 
                 /* FIXME: error_handling */
@@ -233,6 +236,8 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
         memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 
         phy->attached_dev_type = to_dev_type(dr);
+        if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
+                goto out;
         phy->phy_id = phy_id;
         phy->linkrate = dr->linkrate;
         phy->attached_sata_host = dr->attached_sata_host;
@@ -266,6 +271,7 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
                         return;
                 }
 
+ out:
         switch (phy->attached_dev_type) {
         case SATA_PENDING:
                 type = "stp pending";
@@ -304,7 +310,15 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
         else
                 return;
 
-        SAS_DPRINTK("ex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
+        /* if the attached device type changed and ata_eh is active,
+         * make sure we run revalidation when eh completes (see:
+         * sas_enable_revalidation)
+         */
+        if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
+                set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);
+
+        SAS_DPRINTK("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
+                    test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",
                     SAS_ADDR(dev->sas_addr), phy->phy_id,
                     sas_route_char(dev, phy), phy->linkrate,
                     SAS_ADDR(phy->attached_sas_addr), type);