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authorJeff Skirvin <jeffrey.d.skirvin@intel.com>2012-03-08 22:42:03 -0800
committerDan Williams <dan.j.williams@intel.com>2012-05-17 14:33:41 -0700
commit033d19d298b4245da2d3d6c795ea97e419f9ac61 (patch)
tree2e66627f294b9e2b52174e719ff987464cedaeec /drivers/scsi
parent0c3ce38f1bc8b6a6d8df0959e3c0dece31f9350c (diff)
downloadlinux-linaro-stable-033d19d298b4245da2d3d6c795ea97e419f9ac61.tar.gz
isci: Callbacks to libsas occur under scic_lock and are synchronized.
This patch changes the callback mechanism to libsas to only occur while the scic_lock is held; the abort path cleanup of I/Os also checks to make sure IREQ_ABORT_PATH_ACTIVE is clear before proceding. 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')
-rw-r--r--drivers/scsi/isci/host.c10
-rw-r--r--drivers/scsi/isci/remote_device.c43
2 files changed, 40 insertions, 13 deletions
diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c
index 25d537e2f5c4..53c3ad64c998 100644
--- a/drivers/scsi/isci/host.c
+++ b/drivers/scsi/isci/host.c
@@ -1105,8 +1105,6 @@ void isci_host_completion_routine(unsigned long data)
list_splice_init(&ihost->requests_to_complete,
&completed_request_list);
- spin_unlock_irq(&ihost->scic_lock);
-
/* Process any completions in the list. */
list_for_each_safe(current_position, next_position,
&completed_request_list) {
@@ -1115,7 +1113,6 @@ void isci_host_completion_routine(unsigned long data)
completed_node);
task = isci_request_access_task(request);
-
/* Return the task to libsas */
if (task != NULL) {
@@ -1141,11 +1138,12 @@ void isci_host_completion_routine(unsigned long data)
}
}
}
+ if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &request->flags))
+ wake_up_all(&ihost->eventq);
- spin_lock_irq(&ihost->scic_lock);
isci_free_tag(ihost, request->io_tag);
- spin_unlock_irq(&ihost->scic_lock);
}
+ spin_unlock_irq(&ihost->scic_lock);
/* the coalesence timeout doubles at each encoding step, so
* update it based on the ilog2 value of the outstanding requests
@@ -2703,8 +2701,6 @@ enum sci_status sci_controller_complete_io(struct isci_host *ihost,
index = ISCI_TAG_TCI(ireq->io_tag);
clear_bit(IREQ_ACTIVE, &ireq->flags);
- if (test_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
- wake_up_all(&ihost->eventq);
return SCI_SUCCESS;
default:
dev_warn(&ihost->pdev->dev, "%s invalid state: %d\n",
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index d1c2a2294a32..21a9800a9bec 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -145,6 +145,39 @@ static bool isci_compare_suspendcount(
return localcount != idev->rnc.suspend_count;
}
+static bool isci_check_reqterm(
+ struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ struct isci_request *ireq,
+ u32 localcount)
+{
+ unsigned long flags;
+ bool res;
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+ res = isci_compare_suspendcount(idev, localcount)
+ && !test_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+ return res;
+}
+
+static bool isci_check_devempty(
+ struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ u32 localcount)
+{
+ unsigned long flags;
+ bool res;
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+ res = isci_compare_suspendcount(idev, localcount)
+ && idev->started_request_count == 0;
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+ return res;
+}
+
enum sci_status isci_remote_device_terminate_requests(
struct isci_host *ihost,
struct isci_remote_device *idev,
@@ -179,17 +212,15 @@ enum sci_status isci_remote_device_terminate_requests(
sci_remote_device_terminate_req(ihost, idev, 0, ireq);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
wait_event(ihost->eventq,
- (isci_compare_suspendcount(idev,
- rnc_suspend_count)
- && !test_bit(IREQ_ACTIVE, &ireq->flags)));
+ isci_check_reqterm(ihost, idev, ireq,
+ rnc_suspend_count));
} else {
/* Terminate all TCs. */
sci_remote_device_terminate_requests(idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
wait_event(ihost->eventq,
- (isci_compare_suspendcount(idev,
- rnc_suspend_count)
- && idev->started_request_count == 0));
+ isci_check_devempty(ihost, idev,
+ rnc_suspend_count));
}
dev_dbg(&ihost->pdev->dev, "%s: idev=%p, wait done\n",
__func__, idev);