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

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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: Avi Kivity <avi@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Avi Kivity 2010-05-16 14:59:57 +03:00 committed by Kevin Wolf
parent 81a204e443
commit c53a7285b4
1 changed files with 3 additions and 1 deletions
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4
aio.c
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@ -113,7 +113,9 @@ void qemu_aio_flush(void)
qemu_aio_wait(); qemu_aio_wait();
QLIST_FOREACH(node, &aio_handlers, node) { 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); } while (qemu_bh_poll() || ret > 0);
} }