srp: skip test if scsi_transport_srp module is loaded and in use

The srp/* tests requires exclusive access to scsi_transport_srp
module. Running srp/* tests would definitely fail if the test can't
get exclusive access of scsi_transport_srp module as shown below:

$ lsmod | grep scsi_transport_srp
scsi_transport_srp    327680  1 ibmvscsi

$ ./check srp/001
srp/001 (Create and remove LUNs)                             [failed]
    runtime    ...  0.249s
tests/srp/rc: line 263: /sys/class/srp_remote_ports/port-0:1/delete: Permission denied
tests/srp/rc: line 263: /sys/class/srp_remote_ports/port-0:1/delete: Permission denied
modprobe: FATAL: Module scsi_transport_srp is in use.
error: Invalid argument
error: Invalid argument

So if the scsi_transport_srp module is loaded and in use then skip
running srp/* tests.

Signed-off-by: Nilay Shroff <[email protected]>
Tested-by: Disha Goel <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
[Shin'ichiro: removed extra spaces and fixed a shellcheck warning]
Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: shroffni

common/rc

@@ -78,6 +78,19 @@ _have_module() {
 	return 0
 }
 
+_module_not_in_use() {
+	local refcnt
+
+	_have_module "$1" || return
+
+	if [ -d "/sys/module/$1" ]; then
+		refcnt="$(cat /sys/module/"$1"/refcnt)"
+		if [ "$refcnt" -ne "0" ]; then
+			SKIP_REASONS+=("module $1 is in use")
+		fi
+	fi
+}
+
 _have_module_param() {
 	 _have_driver "$1" || return
 

tests/srp/rc

@@ -61,6 +61,7 @@ group_requires() {
 	_have_module scsi_debug
 	_have_module target_core_iblock
 	_have_module target_core_mod
+	_module_not_in_use scsi_transport_srp
 
 	for p in mkfs.ext4 mkfs.xfs multipath multipathd pidof rdma \
 		 sg_reset fio; do