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[SCSI] zfcp: Hold queue lock when checking port/unit handle for task management cmd

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We need to hold the queue-lock when checking whether we still have a valid
unit/port handle for the task management 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@de.ibm.com>
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Christof Schmitt 2007-12-20 12:30:27 +01:00 committed by James Bottomley
parent ba1724202a
commit fdf234527a
1 changed files with 9 additions and 17 deletions
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26
drivers/s390/scsi/zfcp_fsf.c
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@ -3774,6 +3774,10 @@ zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
goto out;
}
if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
&unit->status)))
goto unit_blocked;
/*
* Used to decide on proper handler in the return path,
* could be either zfcp_fsf_send_fcp_command_task_handler or
@ -3807,25 +3811,13 @@ zfcp_fsf_send_fcp_command_task_management(struct zfcp_adapter *adapter,
zfcp_fsf_start_timer(fsf_req, ZFCP_SCSI_ER_TIMEOUT);
retval = zfcp_fsf_req_send(fsf_req);
if (retval) {
ZFCP_LOG_INFO("error: Could not send an FCP-command (task "
"management) on adapter %s, port 0x%016Lx for "
"unit LUN 0x%016Lx\n",
zfcp_get_busid_by_adapter(adapter),
unit->port->wwpn,
unit->fcp_lun);
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
if (!retval)
goto out;
}
ZFCP_LOG_TRACE("Send FCP Command (task management function) initiated "
"(adapter %s, port 0x%016Lx, unit 0x%016Lx, "
"tm_flags=0x%x)\n",
zfcp_get_busid_by_adapter(adapter),
unit->port->wwpn,
unit->fcp_lun,
tm_flags);
unit_blocked:
zfcp_fsf_req_free(fsf_req);
fsf_req = NULL;
out:
write_unlock_irqrestore(&adapter->request_queue.queue_lock, lock_flags);
return fsf_req;