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isci: Implement waiting for suspend in the abort path.

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In order to prevent a device from receiving an I/O request while still
in an RNC suspending or resuming state (and therefore failing that
I/O back to libsas with a reset required status) wait for the RNC state
change before proceding in the abort path.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jeff Skirvin
2012-03-08 22:42:01 -08:00
committed by Dan Williams
parent 08c031e4e3
commit 31a38ef0a5
5 changed files with 66 additions and 22 deletions
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44
drivers/scsi/isci/remote_device.c
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@@ -137,6 +137,14 @@ static enum sci_status sci_remote_device_terminate_reqs_checkabort(
return status;
}
static bool isci_compare_suspendcount(
struct isci_remote_device *idev,
u32 localcount)
{
smp_rmb();
return localcount != idev->rnc.suspend_count;
}
enum sci_status isci_remote_device_terminate_requests(
struct isci_host *ihost,
struct isci_remote_device *idev,
@@ -144,31 +152,44 @@ enum sci_status isci_remote_device_terminate_requests(
{
enum sci_status status = SCI_SUCCESS;
unsigned long flags;
u32 rnc_suspend_count;
spin_lock_irqsave(&ihost->scic_lock, flags);
if (isci_get_device(idev) == NULL) {
dev_dbg(&ihost->pdev->dev, "%s: failed isci_get_device(idev=%p)\n",
__func__, idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
status = SCI_FAILURE;
} else {
/* If already suspended, don't wait for another suspension. */
smp_rmb();
rnc_suspend_count
= sci_remote_node_context_is_suspended(&idev->rnc)
? 0 : idev->rnc.suspend_count;
dev_dbg(&ihost->pdev->dev,
"%s: idev=%p, ireq=%p; started_request_count=%d, "
"rnc_suspend_count=%d, rnc.suspend_count=%d"
"about to wait\n",
__func__, idev, ireq, idev->started_request_count);
__func__, idev, ireq, idev->started_request_count,
rnc_suspend_count, idev->rnc.suspend_count);
if (ireq) {
/* Terminate a specific TC. */
sci_remote_device_terminate_req(ihost, idev, 0, ireq);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
wait_event(ihost->eventq, !test_bit(IREQ_ACTIVE,
&ireq->flags));
wait_event(ihost->eventq,
(isci_compare_suspendcount(idev,
rnc_suspend_count)
&& !test_bit(IREQ_ACTIVE, &ireq->flags)));
} else {
/* Terminate all TCs. */
sci_remote_device_terminate_requests(idev);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
wait_event(ihost->eventq,
idev->started_request_count == 0);
(isci_compare_suspendcount(idev,
rnc_suspend_count)
&& idev->started_request_count == 0));
}
dev_dbg(&ihost->pdev->dev, "%s: idev=%p, wait done\n",
__func__, idev);
@@ -1234,19 +1255,20 @@ enum sci_status sci_remote_device_resume(
return status;
}
enum sci_status isci_remote_device_resume(
enum sci_status isci_remote_device_resume_from_abort(
struct isci_host *ihost,
struct isci_remote_device *idev,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
struct isci_remote_device *idev)
{
unsigned long flags;
enum sci_status status;
spin_lock_irqsave(&ihost->scic_lock, flags);
status = sci_remote_device_resume(idev, cb_fn, cb_p);
/* Preserve any current resume callbacks, for instance from other
* resumptions.
*/
status = sci_remote_device_resume(idev, idev->rnc.user_callback,
idev->rnc.user_cookie);
spin_unlock_irqrestore(&ihost->scic_lock, flags);
return status;
}
/**