block/001: don't exit test with pending async scan

We have to run scan and delete together, otherwise pending async
may prevent scsi_debug from being unloaded, and cause failure of
'modprobe: FATAL: Module scsi_debug is in use.'

Fix the issue by always running both scan and delete together.

Fixes: f3bcd8c ("block/001: wait until device is added")
Reported-by: Yi Zhang <[email protected]>
Signed-off-by: Ming Lei <[email protected]>

Author: Ming Lei

tests/block/001

@@ -29,13 +29,10 @@ stress_scsi_debug() {
 		scan="${scan//:/ }"
 		while [[ ! -e "$TMPDIR/stop" ]]; do
 			echo "${scan}" > "/sys/class/scsi_host/host${host}/scan"
-			while [[ ! -e "$TMPDIR/stop" ]]; do
-				if [[ -d "/sys/class/scsi_device/${target}" ]]; then
-					echo 1 > "/sys/class/scsi_device/${target}/device/delete"
-					break
-				fi
+			while [[ ! -d "/sys/class/scsi_device/${target}" ]]; do
 				sleep 0.01
 			done
+			echo 1 > "/sys/class/scsi_device/${target}/device/delete"
 		done
 		) &
 	done