[SCSI] zfcp: Hold queue lock when checking port handle for ELS command

We need to hold the queue-lock when checking whether we still have a valid port
handle for the ELS command, i.e whether we can issue this request for this
port. If the error recovery is about to close this port, then it competes for
the queue-lock. If the close request issued by the error recovery wins, then it
is guaranteed that this 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>

diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index 76fef3f..4f86c0e 100644 (file)
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -456,7 +456,7 @@ zfcp_test_link(struct zfcp_port *port)
 
        zfcp_port_get(port);
        retval = zfcp_erp_adisc(port);
-       if (retval != 0) {
+       if (retval != 0 && retval != -EBUSY) {
                zfcp_port_put(port);
                ZFCP_LOG_NORMAL("reopen needed for port 0x%016Lx "
                                "on adapter %s\n ", port->wwpn,

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 665fcb6..908e8b2 100644 (file)
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -1668,6 +1668,12 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
                 goto failed_req;
        }
 
+       if (unlikely(!atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED,
+                       &els->port->status))) {
+               ret = -EBUSY;
+               goto port_blocked;
+       }
+
        sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
         if (zfcp_use_one_sbal(els->req, els->req_count,
                               els->resp, els->resp_count)){
@@ -1749,6 +1755,7 @@ zfcp_fsf_send_els(struct zfcp_send_els *els)
                       "0x%06x)\n", zfcp_get_busid_by_adapter(adapter), d_id);
        goto out;
 
+ port_blocked:
  failed_send:
        zfcp_fsf_req_free(fsf_req);