1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index f3509120a507..2678a8347729 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -82,6 +82,7 @@ static void dasd_profile_exit(struct dasd_profile *);
 static wait_queue_head_t dasd_init_waitq;
 static wait_queue_head_t dasd_flush_wq;
 static wait_queue_head_t generic_waitq;
+static wait_queue_head_t shutdown_waitq;
 
 /*
  * Allocate memory for a new device structure.
@@ -1994,6 +1995,8 @@ static void dasd_device_tasklet(struct dasd_device *device)
         /* Now check if the head of the ccw queue needs to be started. */
         __dasd_device_start_head(device);
         spin_unlock_irq(get_ccwdev_lock(device->cdev));
+        if (waitqueue_active(&shutdown_waitq))
+                wake_up(&shutdown_waitq);
         dasd_put_device(device);
 }
 
@@ -2632,6 +2635,8 @@ static void dasd_block_tasklet(struct dasd_block *block)
         __dasd_block_start_head(block);
         spin_unlock(&block->queue_lock);
         spin_unlock_irq(&block->request_queue_lock);
+        if (waitqueue_active(&shutdown_waitq))
+                wake_up(&shutdown_waitq);
         dasd_put_device(block->base);
 }
 
@@ -3474,6 +3479,32 @@ char *dasd_get_sense(struct irb *irb)
 }
 EXPORT_SYMBOL_GPL(dasd_get_sense);
 
+static inline int _wait_for_empty_queues(struct dasd_device *device)
+{
+        if (device->block)
+                return list_empty(&device->ccw_queue) &&
+                        list_empty(&device->block->ccw_queue);
+        else
+                return list_empty(&device->ccw_queue);
+}
+
+void dasd_generic_shutdown(struct ccw_device *cdev)
+{
+        struct dasd_device *device;
+
+        device = dasd_device_from_cdev(cdev);
+        if (IS_ERR(device))
+                return;
+
+        if (device->block)
+                dasd_schedule_block_bh(device->block);
+
+        dasd_schedule_device_bh(device);
+
+        wait_event(shutdown_waitq, _wait_for_empty_queues(device));
+}
+EXPORT_SYMBOL_GPL(dasd_generic_shutdown);
+
 static int __init dasd_init(void)
 {
         int rc;
@@ -3481,6 +3512,7 @@ static int __init dasd_init(void)
         init_waitqueue_head(&dasd_init_waitq);
         init_waitqueue_head(&dasd_flush_wq);
         init_waitqueue_head(&generic_waitq);
+        init_waitqueue_head(&shutdown_waitq);
 
         /* register 'common' DASD debug area, used for all DBF_XXX calls */
         dasd_debug_area = debug_register("dasd", 1, 1, 8 * sizeof(long));