[SCSI] zfcp: Only issue one test link command per port

When the FCP channel returns a series of commands with the error
status "test link", zfcp will send a series of ELS ADISC commands.
This is technically no problem, but it is enough to only issue one
test command per remote port. So, track whether a ELS ADISC command is
already pending, and do not send a new one if there is already a
pending command.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 601f5a575def..c1becfc1e7fe 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -232,6 +232,7 @@ struct zfcp_ls_adisc {
 
 /* remote port status */
 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
+#define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
 
 /* well known address (WKA) port status*/
 enum zfcp_wka_status {