static int afu_dma_pin_pages()

in dfl-afu-dma-region.c [34:72]

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

static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
			     struct dfl_afu_dma_region *region)
{
	int npages = region->length >> PAGE_SHIFT;
	struct device *dev = &pdata->dev->dev;
	int ret, pinned;

	ret = account_locked_vm(current->mm, npages, true);
	if (ret)
		return ret;

	region->pages = kcalloc(npages, sizeof(struct page *), GFP_KERNEL);
	if (!region->pages) {
		ret = -ENOMEM;
		goto unlock_vm;
	}

	pinned = pin_user_pages_fast(region->user_addr, npages, FOLL_WRITE,
				     region->pages);
	if (pinned < 0) {
		ret = pinned;
		goto free_pages;
	} else if (pinned != npages) {
		ret = -EFAULT;
		goto unpin_pages;
	}

	dev_dbg(dev, "%d pages pinned\n", pinned);

	return 0;

unpin_pages:
	unpin_user_pages(region->pages, pinned);
free_pages:
	kfree(region->pages);
unlock_vm:
	account_locked_vm(current->mm, npages, false);
	return ret;
}