From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Use thread_pool_submit_co, instead of reinventing it here. Note, that
thread_pool_submit_aio() never returns NULL, so checking it was an
extra thing.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190506142741.41731-4-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-threads.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/block/qcow2-threads.c b/block/qcow2-threads.c
index 85b8034fd2..5a39fdac69 100644
--- a/block/qcow2-threads.c
+++ b/block/qcow2-threads.c
@@ -144,17 +144,11 @@ static int qcow2_compress_pool_func(void *opaque)
     return 0;
 }
 
-static void qcow2_compress_complete(void *opaque, int ret)
-{
-    qemu_coroutine_enter(opaque);
-}
-
 static ssize_t coroutine_fn
 qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
                      const void *src, size_t src_size, Qcow2CompressFunc func)
 {
     BDRVQcow2State *s = bs->opaque;
-    BlockAIOCB *acb;
     ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
     Qcow2CompressData arg = {
         .dest = dest,
@@ -169,16 +163,9 @@ qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size,
     }
 
     s->nb_compress_threads++;
-    acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg,
-                                 qcow2_compress_complete,
-                                 qemu_coroutine_self());
-
-    if (!acb) {
-        s->nb_compress_threads--;
-        return -EINVAL;
-    }
-    qemu_coroutine_yield();
+    thread_pool_submit_co(pool, qcow2_compress_pool_func, &arg);
     s->nb_compress_threads--;
+
     qemu_co_queue_next(&s->compress_wait_queue);
 
     return arg.ret;
-- 
2.21.0