[SCSI] libsas: don't recover end devices attached to disabled phys

If userspace has decided to disable a phy the kernel should honor that
and not inadvertantly re-enable the phy via error recovery.  This is
more straightforward in the sata case where link recovery (via
libata-eh) is separate from sas_task cancelling in libsas-eh.  Teach
libsas to accept -ENODEV as a successful response from I_T_nexus_reset
('successful' in terms of not escalating further).

This is a more comprehensive fix then "libsas: don't recover 'gone'
devices in sas_ata_hard_reset()", as it is no longer sata-specific.

aic94xx does check the return value from sas_phy_reset() so if the phy
is disabled we proceed with clearing the I_T_nexus.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

4 files changed, 8 insertions, 5 deletions

diff --git a/drivers/scsi/aic94xx/aic94xx_tmf.c b/drivers/scsi/aic94xx/aic94xx_tmf.c
index 50b914ffab94..cf9040933da6 100644
--- a/drivers/scsi/aic94xx/aic94xx_tmf.c
+++ b/drivers/scsi/aic94xx/aic94xx_tmf.c
@@ -192,7 +192,7 @@ int asd_I_T_nexus_reset(struct domain_device *dev)
         ASD_DPRINTK("sending %s reset to %s\n",
                     reset_type ? "hard" : "soft", dev_name(&phy->dev));
         res = sas_phy_reset(phy, reset_type);
-        if (res == TMF_RESP_FUNC_COMPLETE) {
+        if (res == TMF_RESP_FUNC_COMPLETE || res == -ENODEV) {
                 /* wait for the maximum settle time */
                 msleep(500);
                 /* clear all outstanding commands (keep nexus suspended) */
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 08d2103a45b7..bc0cecc6ad62 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -407,10 +407,9 @@ static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
         struct domain_device *dev = ap->private_data;
         struct sas_internal *i = dev_to_sas_internal(dev);
 
-        if (test_bit(SAS_DEV_GONE, &dev->state))
-                return -ENODEV;
-
         res = i->dft->lldd_I_T_nexus_reset(dev);
+        if (res == -ENODEV)
+                return res;
 
         if (res != TMF_RESP_FUNC_COMPLETE)
                 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index 09c14ca3fbd5..120bff64be30 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -298,6 +298,9 @@ int sas_phy_reset(struct sas_phy *phy, int hard_reset)
         int ret;
         enum phy_func reset_type;
 
+        if (!phy->enabled)
+                return -ENODEV;
+
         if (hard_reset)
                 reset_type = PHY_FUNC_HARD_RESET;
         else
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index fd3291337c1b..f0b9b7bf1882 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -607,7 +607,8 @@ static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *
                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
                                     task);
                         tmf_resp = sas_recover_I_T(task->dev);
-                        if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
+                        if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
+                            tmf_resp == -ENODEV) {
                                 struct domain_device *dev = task->dev;
                                 SAS_DPRINTK("I_T %016llx recovered\n",
                                             SAS_ADDR(task->dev->sas_addr));