aio: fix aio_ctx_prepare with idle bottom halves
Commit ed2aec4867f0d5f5de496bb765347b5d0cfe113d changed the return
value of aio_ctx_prepare from false to true when only idle bottom
halves are available. This broke PC old-style DMA, which uses them.
Fix this by making aio_ctx_prepare return true only when non-idle
bottom halves are scheduled to run.
Reported-by: malc <av1474@comtv.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: malc <av1474@comtv.ru>
diff --git a/async.c b/async.c
index 04f9dcb..3f0e8f3 100644
--- a/async.c
+++ b/async.c
@@ -122,11 +122,9 @@
{
AioContext *ctx = (AioContext *) source;
QEMUBH *bh;
- bool scheduled = false;
for (bh = ctx->first_bh; bh; bh = bh->next) {
if (!bh->deleted && bh->scheduled) {
- scheduled = true;
if (bh->idle) {
/* idle bottom halves will be polled at least
* every 10ms */
@@ -135,12 +133,12 @@
/* non-idle bottom halves will be executed
* immediately */
*timeout = 0;
- break;
+ return true;
}
}
}
- return scheduled;
+ return false;
}
static gboolean
