static int tmc_pages_alloc()

in coresight/coresight-tmc-etr.c [188:231]

• 41 lines of code
• 8 McCabe index (conditional complexity)

static int tmc_pages_alloc(struct tmc_pages *tmc_pages,
			   struct device *dev, int node,
			   enum dma_data_direction dir, void **pages)
{
	int i, nr_pages;
	dma_addr_t paddr;
	struct page *page;
	struct device *real_dev = dev->parent;

	nr_pages = tmc_pages->nr_pages;
	tmc_pages->daddrs = kcalloc(nr_pages, sizeof(*tmc_pages->daddrs),
					 GFP_KERNEL);
	if (!tmc_pages->daddrs)
		return -ENOMEM;
	tmc_pages->pages = kcalloc(nr_pages, sizeof(*tmc_pages->pages),
					 GFP_KERNEL);
	if (!tmc_pages->pages) {
		kfree(tmc_pages->daddrs);
		tmc_pages->daddrs = NULL;
		return -ENOMEM;
	}

	for (i = 0; i < nr_pages; i++) {
		if (pages && pages[i]) {
			page = virt_to_page(pages[i]);
			/* Hold a refcount on the page */
			get_page(page);
		} else {
			page = alloc_pages_node(node,
						GFP_KERNEL | __GFP_ZERO, 0);
			if (!page)
				goto err;
		}
		paddr = dma_map_page(real_dev, page, 0, PAGE_SIZE, dir);
		if (dma_mapping_error(real_dev, paddr))
			goto err;
		tmc_pages->daddrs[i] = paddr;
		tmc_pages->pages[i] = page;
	}
	return 0;
err:
	tmc_pages_free(tmc_pages, dev, dir);
	return -ENOMEM;
}