static void vm_set()

in virtio_mmio.c [189:230]

• 38 lines of code
• 7 McCabe index (conditional complexity)

static void vm_set(struct virtio_device *vdev, unsigned offset,
		   const void *buf, unsigned len)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
	void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG;
	u8 b;
	__le16 w;
	__le32 l;

	if (vm_dev->version == 1) {
		const u8 *ptr = buf;
		int i;

		for (i = 0; i < len; i++)
			writeb(ptr[i], base + offset + i);

		return;
	}

	switch (len) {
	case 1:
		memcpy(&b, buf, sizeof b);
		writeb(b, base + offset);
		break;
	case 2:
		memcpy(&w, buf, sizeof w);
		writew(le16_to_cpu(w), base + offset);
		break;
	case 4:
		memcpy(&l, buf, sizeof l);
		writel(le32_to_cpu(l), base + offset);
		break;
	case 8:
		memcpy(&l, buf, sizeof l);
		writel(le32_to_cpu(l), base + offset);
		memcpy(&l, buf + sizeof l, sizeof l);
		writel(le32_to_cpu(l), base + offset + sizeof l);
		break;
	default:
		BUG();
	}
}