async: Remove AsyncContext

The purpose of AsyncContexts was to protect qcow and qcow2 against reentrancy
during an emulated bdrv_read/write (which includes a qemu_aio_wait() call and
can run AIO callbacks of different requests if it weren't for AsyncContexts).

Now both qcow and qcow2 are protected by CoMutexes and AsyncContexts can be
removed.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/block/qed.c b/block/qed.c
index 39703793e9..333f067582 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -680,16 +680,12 @@ static int bdrv_qed_is_allocated(BlockDriverState *bs, int64_t sector_num,
     };
     QEDRequest request = { .l2_table = NULL };
 
-    async_context_push();
-
     qed_find_cluster(s, &request, pos, len, qed_is_allocated_cb, &cb);
 
     while (cb.is_allocated == -1) {
         qemu_aio_wait();
     }
 
-    async_context_pop();
-
     qed_unref_l2_cache_entry(request.l2_table);
 
     return cb.is_allocated;