[SCSI] zfcp: Hold queue lock when checking port/unit handle for abort command

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@de.ibm.com>
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 8 insertions, 13 deletions

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index e697b1cb6d27..665fcb6ec5d5 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -1116,6 +1116,10 @@ zfcp_fsf_abort_fcp_command(unsigned long old_req_id,
                 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 old_req_id,
 
         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;