qemu-io-cmds: Use bdrv_coroutine_enter
qemu_coroutine_create associates @co to qemu_aio_context but we poll blk's context below. If the coroutine yields, it may never get resumed again. Use bdrv_coroutine_enter to make sure we are starting the I/O on the right context. Signed-off-by: NFam Zheng <famz@redhat.com> Acked-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com>
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