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authorChristof Schmitt <christof.schmitt@de.ibm.com>2007-12-20 12:30:27 +0100
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-11 18:29:07 -0600
commitfdf234527a070f6fc89f3ec5ee4ae1b263e59939 (patch)
treead2b5c44584d1add3519887a8a8aef74f85fa922 /drivers
parentba1724202aafed4bbc4a239ac6fb433f454fddea (diff)
downloadop-kernel-dev-fdf234527a070f6fc89f3ec5ee4ae1b263e59939.zip
op-kernel-dev-fdf234527a070f6fc89f3ec5ee4ae1b263e59939.tar.gz
[SCSI] zfcp: Hold queue lock when checking port/unit handle for task management cmd
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/s390/scsi/zfcp_fsf.c26
1 files changed, 9 insertions, 17 deletions
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 17c251c..fe57941 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -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;
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