From: Christof Schmitt <christof.schmitt@xxxxxxxxxx>
We need to hold the queue-lock when checking whether we still have a valid
unit/port handle for the abort command, i.e whether we can issue this request
for this unit/port. If the error recovery is about to close this unit/port,
then it competes for the queue-lock. If the close request issued by the error
recovery wins, then it is guaranteed that this unit/port has been blocked for
other requests.
Signed-off-by: Christof Schmitt <christof.schmitt@xxxxxxxxxx>
Signed-off-by: Martin Peschke <mp3@xxxxxxxxxx>
---
drivers/s390/scsi/zfcp_fsf.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
--- a/drivers/s390/scsi/zfcp_fsf.c 2007-12-20 11:18:03.000000000 +0100
+++ b/drivers/s390/scsi/zfcp_fsf.c 2007-12-20 11:18:23.000000000 +0100
@@ -1116,6 +1116,10 @@ zfcp_fsf_abort_fcp_command(unsigned long
goto out;
}
+ if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
+ &unit->status)))
+ goto unit_blocked;
+
sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
sbale[0].flags |= SBAL_FLAGS0_TYPE_READ;
sbale[1].flags |= SBAL_FLAGS_LAST_ENTRY;
@@ -1131,22 +1135,13 @@ zfcp_fsf_abort_fcp_command(unsigned long
zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
- if (retval) {
- ZFCP_LOG_INFO("error: Failed to send abort command request "
- "on adapter %s, port 0x%016Lx, unit 0x%016Lx\n",
- zfcp_get_busid_by_adapter(adapter),
- unit->port->wwpn, unit->fcp_lun);
+ if (!retval)
+ goto out;
+
+ unit_blocked:
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
- goto out;
- }
- ZFCP_LOG_DEBUG("Abort FCP Command request initiated "
- "(adapter%s, port d_id=0x%06x, "
- "unit x%016Lx, old_req_id=0x%lx)\n",
- zfcp_get_busid_by_adapter(adapter),
- unit->port->d_id,
- unit->fcp_lun, old_req_id);
out:
write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
return fsf_req;
--
-
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