dasd: fix unresponsive device during format

If path events occur the formatting process stucks because path
events may flush format requests from the queue.

Kick the format process after path events are handled.

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

drivers/s390/block/dasd.c

@@ -1675,8 +1675,11 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
 	if (cqr->status == DASD_CQR_CLEAR_PENDING &&
 	    scsw_fctl(&irb->scsw) & SCSW_FCTL_CLEAR_FUNC) {
 		cqr->status = DASD_CQR_CLEARED;
+		if (cqr->callback_data == DASD_SLEEPON_START_TAG)
+			cqr->callback_data = DASD_SLEEPON_END_TAG;
 		dasd_device_clear_timer(device);
 		wake_up(&dasd_flush_wq);
+		wake_up(&generic_waitq);
 		dasd_schedule_device_bh(device);
 		return;
 	}
@@ -2439,6 +2442,8 @@ int dasd_cancel_req(struct dasd_ccw_req *cqr)
 	case DASD_CQR_QUEUED:
 		/* request was not started - just set to cleared */
 		cqr->status = DASD_CQR_CLEARED;
+		if (cqr->callback_data == DASD_SLEEPON_START_TAG)
+			cqr->callback_data = DASD_SLEEPON_END_TAG;
 		break;
 	case DASD_CQR_IN_IO:
 		/* request in IO - terminate IO and release again */
@@ -3512,6 +3517,10 @@ int dasd_generic_path_operational(struct dasd_device *device)
 	dasd_schedule_device_bh(device);
 	if (device->block)
 		dasd_schedule_block_bh(device->block);
+
+	if (!device->stopped)
+		wake_up(&generic_waitq);
+
 	return 1;
 }
 EXPORT_SYMBOL_GPL(dasd_generic_path_operational);