scsi: zfcp: Report port fc_security as unknown early during remote cable pull

On remote cable pull, a zfcp_port keeps its status and only gets
ZFCP_STATUS_PORT_LINK_TEST added. Only after an ADISC timeout, we would
actually start port recovery and remove ZFCP_STATUS_COMMON_UNBLOCKED which
zfcp_sysfs_port_fc_security_show() detected and reported as "unknown"
instead of the old and possibly stale zfcp_port->connection_info.

Add check for ZFCP_STATUS_PORT_LINK_TEST for timely "unknown" report.

Link: https://lore.kernel.org/r/[email protected]
Fixes: a17c784 ("scsi: zfcp: report FC Endpoint Security in sysfs")
Cc: <[email protected]> Rust-for-Linux#5.7+
Reviewed-by: Benjamin Block <[email protected]>
Signed-off-by: Steffen Maier <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: steffen-maier

drivers/s390/scsi/zfcp_sysfs.c

@@ -487,6 +487,7 @@ static ssize_t zfcp_sysfs_port_fc_security_show(struct device *dev,
 	if (0 == (status & ZFCP_STATUS_COMMON_OPEN) ||
 	    0 == (status & ZFCP_STATUS_COMMON_UNBLOCKED) ||
 	    0 == (status & ZFCP_STATUS_PORT_PHYS_OPEN) ||
+	    0 != (status & ZFCP_STATUS_PORT_LINK_TEST) ||
 	    0 != (status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
 	    0 != (status & ZFCP_STATUS_COMMON_ACCESS_BOXED))
 		i = sprintf(buf, "unknown\n");