common/scsi_debug: ensure scsi_debug is loadable before loading it

Currently, _have_scsi_debug_group_number_stats() assumes that scsi_debug
is loadable. This does not work when scsi_debug is built-in. Before
loading scsi_debug in the function, ensure that scsi_debug is loadable.

Signed-off-by: Shin'ichiro Kawasaki <[email protected]>

Author: kawasaki

common/scsi_debug

@@ -49,6 +49,8 @@ _scsi_debug_key_path() {
 _have_scsi_debug_group_number_stats() {
 	local ret=0
 
+	_have_loadable_scsi_debug || return 1
+
 	modprobe -qr scsi_debug >&/dev/null
 	modprobe -q scsi_debug delay=0 >&/dev/null
 	if ! [[ -e ${SD_PSEUDO_PATH}/group_number_stats ]]; then