Source of sun4i-dma.c - linux-imx - PHYTEC BitBucket (Stash)

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     */
    if (vchan->is_dedicated) {
        i = SUN4I_NDMA_NR_MAX_CHANNELS;
        max = SUN4I_DMA_NR_MAX_CHANNELS;
    } else {
        i = 0;
        max = SUN4I_NDMA_NR_MAX_CHANNELS;
    }
​
    spin_lock_irqsave(&priv->lock, flags);
    for_each_clear_bit_from(i, &priv->pchans_used, max) {
    for_each_clear_bit_from(i, priv->pchans_used, max) {
        pchan = &pchans[i];
        pchan->vchan = vchan;
        set_bit(i, priv->pchans_used);
        break;
    }
    spin_unlock_irqrestore(&priv->lock, flags);
​
    return pchan;
}
​