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block: access wakeup with atomic ops

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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20170605123908.18777-6-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-06-05 14:38:54 +02:00 • committed by Fam Zheng
parent 20fc71b25c
commit e2a6ae7fe5
5 changed files with 15 additions and 7 deletions
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3
block/io.c
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@ -501,7 +501,8 @@ static void dummy_bh_cb(void *opaque)
void bdrv_wakeup(BlockDriverState *bs)
{
if (bs->wakeup) {
/* The barrier (or an atomic op) is in the caller. */
if (atomic_read(&bs->wakeup)) {
aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
}
}