diff options
| author | Christof Schmitt <christof.schmitt@de.ibm.com> | 2007-12-20 12:30:27 +0100 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-01-11 18:29:07 -0600 |
| commit | fdf234527a070f6fc89f3ec5ee4ae1b263e59939 (patch) | |
| tree | ad2b5c44584d1add3519887a8a8aef74f85fa922 /drivers/s390 | |
| parent | ba1724202aafed4bbc4a239ac6fb433f454fddea (diff) | |
| download | linux-fdf234527a070f6fc89f3ec5ee4ae1b263e59939.tar.bz2 | |
[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/s390')
| -rw-r--r-- | drivers/s390/scsi/zfcp_fsf.c | 26 |
1 files changed, 9 insertions, 17 deletions
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c index 17c251cb10aa..fe57941ab55d 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; |