static int uio_dmem_genirq_release()

in uio_dmem_genirq.c [74:103]

• 24 lines of code
• 5 McCabe index (conditional complexity)

static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
{
	struct uio_dmem_genirq_platdata *priv = info->priv;
	struct uio_mem *uiomem;
	int dmem_region = priv->dmem_region_start;

	/* Tell the Runtime PM code that the device has become idle */
	pm_runtime_put_sync(&priv->pdev->dev);

	uiomem = &priv->uioinfo->mem[priv->dmem_region_start];

	mutex_lock(&priv->alloc_lock);

	priv->refcnt--;
	while (!priv->refcnt && uiomem < &priv->uioinfo->mem[MAX_UIO_MAPS]) {
		if (!uiomem->size)
			break;
		if (priv->dmem_region_vaddr[dmem_region]) {
			dma_free_coherent(&priv->pdev->dev, uiomem->size,
					priv->dmem_region_vaddr[dmem_region],
					uiomem->addr);
		}
		uiomem->addr = DMEM_MAP_ERROR;
		++dmem_region;
		++uiomem;
	}

	mutex_unlock(&priv->alloc_lock);
	return 0;
}