diff options
Diffstat (limited to 'drivers/s390/char/tape_core.c')
| -rw-r--r-- | drivers/s390/char/tape_core.c | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/drivers/s390/char/tape_core.c b/drivers/s390/char/tape_core.c index 5d17149a652..c6fab5dbdd4 100644 --- a/drivers/s390/char/tape_core.c +++ b/drivers/s390/char/tape_core.c @@ -761,6 +761,13 @@ __tape_start_next_request(struct tape_device *device) */ if (request->status == TAPE_REQUEST_IN_IO) return; + /* + * Request has already been stopped. We have to wait until + * the request is removed from the queue in the interrupt + * handling. + */ + if (request->status == TAPE_REQUEST_DONE) + return; /* * We wanted to cancel the request but the common I/O layer @@ -1024,6 +1031,20 @@ tape_do_io_interruptible(struct tape_device *device, } /* + * Stop running ccw. + */ +int +tape_cancel_io(struct tape_device *device, struct tape_request *request) +{ + int rc; + + spin_lock_irq(get_ccwdev_lock(device->cdev)); + rc = __tape_cancel_io(device, request); + spin_unlock_irq(get_ccwdev_lock(device->cdev)); + return rc; +} + +/* * Tape interrupt routine, called from the ccw_device layer */ static void @@ -1068,12 +1089,12 @@ __tape_do_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) * error might still apply. So we just schedule the request to be * started later. */ - if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) { - PRINT_WARN("(%s): deferred cc=%i. restaring\n", - cdev->dev.bus_id, - irb->scsw.cc); + if (irb->scsw.cc != 0 && (irb->scsw.fctl & SCSW_FCTL_START_FUNC) && + (request->status == TAPE_REQUEST_IN_IO)) { + DBF_EVENT(3,"(%08x): deferred cc=%i, fctl=%i. restarting\n", + device->cdev_id, irb->scsw.cc, irb->scsw.fctl); request->status = TAPE_REQUEST_QUEUED; - schedule_work(&device->tape_dnr); + schedule_delayed_work(&device->tape_dnr, HZ); return; } @@ -1287,4 +1308,5 @@ EXPORT_SYMBOL(tape_dump_sense_dbf); EXPORT_SYMBOL(tape_do_io); EXPORT_SYMBOL(tape_do_io_async); EXPORT_SYMBOL(tape_do_io_interruptible); +EXPORT_SYMBOL(tape_cancel_io); EXPORT_SYMBOL(tape_mtop); |