isci: Don't wait for an RNC suspend if it's being destroyed.

Make sure that the wait for suspend can handle the RNC destruction case.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

3 files changed, 28 insertions, 4 deletions

diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index be9f0e0be4ff..68ab4fb9032e 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -142,7 +142,12 @@ static bool isci_compare_suspendcount(
         u32 localcount)
 {
         smp_rmb();
-        return localcount != idev->rnc.suspend_count;
+
+        /* Check for a change in the suspend count, or the RNC
+         * being destroyed.
+         */
+        return (localcount != idev->rnc.suspend_count)
+            || sci_remote_node_context_is_being_destroyed(&idev->rnc);
 }
 
 static bool isci_check_reqterm(
@@ -1380,7 +1385,8 @@ enum sci_status isci_remote_device_resume_from_abort(
         struct isci_remote_device *idev)
 {
         unsigned long flags;
-        enum sci_status status;
+        enum sci_status status = SCI_SUCCESS;
+        int destroyed;
 
         spin_lock_irqsave(&ihost->scic_lock, flags);
         /* Preserve any current resume callbacks, for instance from other
@@ -1390,11 +1396,17 @@ enum sci_status isci_remote_device_resume_from_abort(
         idev->abort_resume_cbparam = idev->rnc.user_cookie;
         set_bit(IDEV_ABORT_PATH_RESUME_PENDING, &idev->flags);
         clear_bit(IDEV_ABORT_PATH_ACTIVE, &idev->flags);
-        status = sci_remote_device_resume(
+        destroyed = sci_remote_node_context_is_being_destroyed(&idev->rnc);
+        if (!destroyed)
+                status = sci_remote_device_resume(
                         idev, isci_remote_device_resume_from_abort_complete,
                         idev);
         spin_unlock_irqrestore(&ihost->scic_lock, flags);
-        isci_remote_device_wait_for_resume_from_abort(ihost, idev);
+        if (!destroyed)
+                isci_remote_device_wait_for_resume_from_abort(ihost, idev);
+        else
+                clear_bit(IDEV_ABORT_PATH_RESUME_PENDING, &idev->flags);
+
         return status;
 }
 
diff --git a/drivers/scsi/isci/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
index a0a62e3a500d..920c2bb39333 100644
--- a/drivers/scsi/isci/remote_node_context.c
+++ b/drivers/scsi/isci/remote_node_context.c
@@ -270,6 +270,8 @@ static void sci_remote_node_context_invalidate_context_buffer(struct sci_remote_
 static void sci_remote_node_context_initial_state_enter(struct sci_base_state_machine *sm)
 {
         struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
+        struct isci_remote_device *idev = rnc_to_dev(rnc);
+        struct isci_host *ihost = idev->owning_port->owning_controller;
 
         /* Check to see if we have gotten back to the initial state because
          * someone requested to destroy the remote node context object.
@@ -277,6 +279,9 @@ static void sci_remote_node_context_initial_state_enter(struct sci_base_state_ma
         if (sm->previous_state_id == SCI_RNC_INVALIDATING) {
                 rnc->destination_state = RNC_DEST_UNSPECIFIED;
                 sci_remote_node_context_notify_user(rnc);
+
+                smp_wmb();
+                wake_up(&ihost->eventq);
         }
 }
 
diff --git a/drivers/scsi/isci/remote_node_context.h b/drivers/scsi/isci/remote_node_context.h
index c61c02e095ad..0d4a24d647b4 100644
--- a/drivers/scsi/isci/remote_node_context.h
+++ b/drivers/scsi/isci/remote_node_context.h
@@ -226,4 +226,11 @@ enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context
 int sci_remote_node_context_is_safe_to_abort(
         struct sci_remote_node_context *sci_rnc);
 
+static inline bool sci_remote_node_context_is_being_destroyed(
+        struct sci_remote_node_context *sci_rnc)
+{
+        return ((sci_rnc->sm.current_state_id == SCI_RNC_INVALIDATING)
+                && (sci_rnc->destination_state == RNC_DEST_FINAL))
+                || (sci_rnc->sm.current_state_id == SCI_RNC_INITIAL);
+}
 #endif  /* _SCIC_SDS_REMOTE_NODE_CONTEXT_H_ */