mlx4_wq_overflow question

[Eli Cohen]

Hi Roland,

referring to the function below, I can't find a strong reason to check
again after acquiring the cq spinlock. Any idea?

static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct
ib_cq *ib_cq)
{
        unsigned cur;
        struct mlx4_ib_cq *cq;

        cur = wq->head - wq->tail;
        if (likely(cur + nreq < wq->max_post))
                return 0;

        cq = to_mcq(ib_cq);
        spin_lock(&cq->lock);
        cur = wq->head - wq->tail;
        spin_unlock(&cq->lock);

        return cur + nreq >= wq->max_post;
}
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