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-rw-r--r--drivers/xen/gntdev.c36
1 files changed, 31 insertions, 5 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 3c2534433b30..bccc54a80559 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -309,9 +309,30 @@ static int map_grant_pages(struct grant_map *map)
return err;
}
+struct unmap_grant_pages_callback_data
+{
+ struct completion completion;
+ int result;
+};
+
+static void unmap_grant_callback(int result,
+ struct gntab_unmap_queue_data *data)
+{
+ struct unmap_grant_pages_callback_data* d = data->data;
+
+ d->result = result;
+ complete(&d->completion);
+}
+
static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
{
int i, err = 0;
+ struct gntab_unmap_queue_data unmap_data;
+ struct unmap_grant_pages_callback_data data;
+
+ init_completion(&data.completion);
+ unmap_data.data = &data;
+ unmap_data.done= &unmap_grant_callback;
if (map->notify.flags & UNMAP_NOTIFY_CLEAR_BYTE) {
int pgno = (map->notify.addr >> PAGE_SHIFT);
@@ -323,11 +344,16 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
}
}
- err = gnttab_unmap_refs(map->unmap_ops + offset,
- use_ptemod ? map->kunmap_ops + offset : NULL, map->pages + offset,
- pages);
- if (err)
- return err;
+ unmap_data.unmap_ops = map->unmap_ops + offset;
+ unmap_data.kunmap_ops = use_ptemod ? map->kunmap_ops + offset : NULL;
+ unmap_data.pages = map->pages + offset;
+ unmap_data.count = pages;
+
+ gnttab_unmap_refs_async(&unmap_data);
+
+ wait_for_completion(&data.completion);
+ if (data.result)
+ return data.result;
for (i = 0; i < pages; i++) {
if (map->unmap_ops[offset+i].status)