> -bool blk_poll(struct request_queue *q, blk_qc_t cookie)
> +int blk_poll(struct request_queue *q, blk_qc_t cookie)
Can you add a comment explaining the return value?
> {
> if (!q->poll_fn || !blk_qc_t_valid(cookie))
> return false;
And false certainly isn't an integer constant..
