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authorJeff Skirvin <jeffrey.d.skirvin@intel.com>2012-03-08 22:42:08 -0800
committerDan Williams <dan.j.williams@intel.com>2012-05-17 14:33:43 -0700
commit1f05388933cb6e57ed9e51768c194ff145002f3b (patch)
tree4e4bae448746ffdb0196b8e16a4f25893eb10855 /drivers/scsi/isci
parentc5457a82a404db3c447df22e6425c5c140c4bee1 (diff)
downloadlinux-linaro-stable-1f05388933cb6e57ed9e51768c194ff145002f3b.tar.gz
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>
Diffstat (limited to 'drivers/scsi/isci')
-rw-r--r--drivers/scsi/isci/remote_device.c20
-rw-r--r--drivers/scsi/isci/remote_node_context.c5
-rw-r--r--drivers/scsi/isci/remote_node_context.h7
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_ */