s390/dasd: Fix unresumed device after suspend/resume having no paths

The DASD device driver prevents I/O from being started on stopped
devices. This also prevented channel paths to be verified and so
the device was unable to be resumed.
Fix by allowing path verification requests on stopped devices.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/block/dasd.c

@@ -2166,18 +2166,22 @@ static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
 			cqr->intrc = -ENOLINK;
 			continue;
 		}
-		/* Don't try to start requests if device is stopped */
-		if (interruptible) {
-			rc = wait_event_interruptible(
-				generic_waitq, !(device->stopped));
-			if (rc == -ERESTARTSYS) {
-				cqr->status = DASD_CQR_FAILED;
-				maincqr->intrc = rc;
-				continue;
-			}
-		} else
-			wait_event(generic_waitq, !(device->stopped));
-
+		/*
+		 * Don't try to start requests if device is stopped
+		 * except path verification requests
+		 */
+		if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
+			if (interruptible) {
+				rc = wait_event_interruptible(
+					generic_waitq, !(device->stopped));
+				if (rc == -ERESTARTSYS) {
+					cqr->status = DASD_CQR_FAILED;
+					maincqr->intrc = rc;
+					continue;
+				}
+			} else
+				wait_event(generic_waitq, !(device->stopped));
+		}
 		if (!cqr->callback)
 			cqr->callback = dasd_wakeup_cb;