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xen/grant: introduce func gnttab_unmap_refs_sync()

Browse source 
There are several place using gnttab async unmap and wait for
completion, so move the common code to a function
gnttab_unmap_refs_sync().

Signed-off-by: Bob Liu <[email protected]>
Acked-by: Roger Pau Monné <[email protected]>
Acked-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: David Vrabel <[email protected]>
This commit is contained in:
Bob Liu 2015-04-03 14:42:59 +08:00 • committed by David Vrabel
commit b44166cd46
4 changed files with 35 additions and 53 deletions
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28
drivers/xen/gntdev.c
View file

@ -327,30 +327,10 @@ 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);
@ -367,11 +347,9 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
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;
err = gnttab_unmap_refs_sync(&unmap_data);
if (err)
return err;
for (i = 0; i < pages; i++) {
if (map->unmap_ops[offset+i].status)

28
drivers/xen/grant-table.c
View file

@ -123,6 +123,11 @@ struct gnttab_ops {
int (*query_foreign_access)(grant_ref_t ref);
};
struct unmap_refs_callback_data {
struct completion completion;
int result;
};
static struct gnttab_ops *gnttab_interface;
static int grant_table_version;
@ -863,6 +868,29 @@ void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item)
}
EXPORT_SYMBOL_GPL(gnttab_unmap_refs_async);
static void unmap_refs_callback(int result,
struct gntab_unmap_queue_data *data)
{
struct unmap_refs_callback_data *d = data->data;
d->result = result;
complete(&d->completion);
}
int gnttab_unmap_refs_sync(struct gntab_unmap_queue_data *item)
{
struct unmap_refs_callback_data data;
init_completion(&data.completion);
item->data = &data;
item->done = &unmap_refs_callback;
gnttab_unmap_refs_async(item);
wait_for_completion(&data.completion);
return data.result;
}
EXPORT_SYMBOL_GPL(gnttab_unmap_refs_sync);
static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes)
{
int rc;