[S390] dasd: unit check handling during internal cio I/O

React on unit checks during cio internal I/O.
Handle as unsolicited interrupt and advice cio to retry.

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

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 0e86247d791e..33975e922d65 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1186,6 +1186,29 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
         dasd_schedule_device_bh(device);
 }
 
+enum uc_todo dasd_generic_uc_handler(struct ccw_device *cdev, struct irb *irb)
+{
+        struct dasd_device *device;
+
+        device = dasd_device_from_cdev_locked(cdev);
+
+        if (IS_ERR(device))
+                goto out;
+        if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
+           device->state != device->target ||
+           !device->discipline->handle_unsolicited_interrupt){
+                dasd_put_device(device);
+                goto out;
+        }
+
+        dasd_device_clear_timer(device);
+        device->discipline->handle_unsolicited_interrupt(device, irb);
+        dasd_put_device(device);
+out:
+        return UC_TODO_RETRY;
+}
+EXPORT_SYMBOL_GPL(dasd_generic_uc_handler);
+
 /*
  * If we have an error on a dasd_block layer request then we cancel
  * and return all further requests from the same dasd_block as well.