diff options
| -rw-r--r-- | drivers/xen/gntdev.c | 36 |
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) |