static int uio_dmem_genirq_open()

in uio_dmem_genirq.c [44:72]

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

static int uio_dmem_genirq_open(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;

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

	mutex_lock(&priv->alloc_lock);
	while (!priv->refcnt && uiomem < &priv->uioinfo->mem[MAX_UIO_MAPS]) {
		void *addr;
		if (!uiomem->size)
			break;

		addr = dma_alloc_coherent(&priv->pdev->dev, uiomem->size,
				(dma_addr_t *)&uiomem->addr, GFP_KERNEL);
		if (!addr) {
			uiomem->addr = DMEM_MAP_ERROR;
		}
		priv->dmem_region_vaddr[dmem_region++] = addr;
		++uiomem;
	}
	priv->refcnt++;

	mutex_unlock(&priv->alloc_lock);
	/* Wait until the Runtime PM code has woken up the device */
	pm_runtime_get_sync(&priv->pdev->dev);
	return 0;
}