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isci: Wait for RNC resumption before leaving the abort path.

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In the case of TMF execution, or device resets, wait for the RNC to fully
resume before returning to the caller.  This ensures that the remote
device will not fail I/O requests while waiting for the RNC resumption to
complete.

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 22:42:04 -08:00 committed by Dan Williams
parent d76689e46c
commit 0cce165e28
2 changed files with 53 additions and 2 deletions
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52
drivers/scsi/isci/remote_device.c
View File

@ -1289,6 +1289,48 @@ enum sci_status sci_remote_device_resume(
return status;
}
static void isci_remote_device_resume_from_abort_complete(void *cbparam)
{
struct isci_remote_device *idev = cbparam;
struct isci_host *ihost = idev->owning_port->owning_controller;
scics_sds_remote_node_context_callback abort_resume_cb =
idev->abort_resume_cb;
dev_dbg(scirdev_to_dev(idev), "%s: passing-along resume: %p\n",
__func__, abort_resume_cb);
if (abort_resume_cb != NULL) {
idev->abort_resume_cb = NULL;
abort_resume_cb(idev->abort_resume_cbparam);
}
clear_bit(IDEV_ABORT_PATH_RESUME_PENDING, &idev->flags);
wake_up(&ihost->eventq);
}
void isci_remote_device_wait_for_resume_from_abort(
struct isci_host *ihost,
struct isci_remote_device *idev)
{
dev_dbg(scirdev_to_dev(idev), "%s: starting resume wait: %p\n",
__func__, idev);
#define MAX_RESUME_MSECS 5
if (!wait_event_timeout(ihost->eventq,
(!test_bit(IDEV_ABORT_PATH_RESUME_PENDING,
&idev->flags)
|| test_bit(IDEV_STOP_PENDING, &idev->flags)),
msecs_to_jiffies(MAX_RESUME_MSECS))) {
dev_warn(scirdev_to_dev(idev), "%s: #### Timeout waiting for "
"resume: %p\n", __func__, idev);
}
clear_bit(IDEV_ABORT_PATH_RESUME_PENDING, &idev->flags);
dev_dbg(scirdev_to_dev(idev), "%s: resume wait done: %p\n",
__func__, idev);
}
enum sci_status isci_remote_device_resume_from_abort(
struct isci_host *ihost,
struct isci_remote_device *idev)
@ -1300,12 +1342,18 @@ enum sci_status isci_remote_device_resume_from_abort(
/* Preserve any current resume callbacks, for instance from other
* resumptions.
*/
idev->abort_resume_cb = idev->rnc.user_callback;
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(idev, idev->rnc.user_callback,
idev->rnc.user_cookie);
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);
return status;
}
/**
* sci_remote_device_start() - This method will start the supplied remote
* device. This method enables normal IO requests to flow through to the

3
drivers/scsi/isci/remote_device.h
View File

@ -87,6 +87,7 @@ struct isci_remote_device {
#define IDEV_IO_NCQERROR 5
#define IDEV_RNC_LLHANG_ENABLED 6
#define IDEV_ABORT_PATH_ACTIVE 7
#define IDEV_ABORT_PATH_RESUME_PENDING 8
unsigned long flags;
struct kref kref;
struct isci_port *isci_port;
@ -101,6 +102,8 @@ struct isci_remote_device {
u32 started_request_count;
struct isci_request *working_request;
u32 not_ready_reason;
scics_sds_remote_node_context_callback abort_resume_cb;
void *abort_resume_cbparam;
};
#define ISCI_REMOTE_DEVICE_START_TIMEOUT 5000