Commit c53a7285 authored by Avi Kivity's avatar Avi Kivity Committed by Kevin Wolf

block: fix aio_flush segfaults for read-only protocols (e.g. curl)

Not all block format drivers expose an io_flush method (reasonable for
read-only protocols), so calling io_flush there will immediately segfault.

Fix by checking for the method's existence before calling it.
Signed-off-by: default avatarAvi Kivity <>
Signed-off-by: default avatarKevin Wolf <>
parent 81a204e4
......@@ -113,7 +113,9 @@ void qemu_aio_flush(void)
QLIST_FOREACH(node, &aio_handlers, node) {
ret |= node->io_flush(node->opaque);
if (node->io_flush) {
ret |= node->io_flush(node->opaque);
} while (qemu_bh_poll() || ret > 0);
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