drm/nouveau/bios: fix shadowing of ACPI ROMs larger than 64KiB

nouveau_bios_shadow_acpi(struct nouveau_bios *bios)

{

	struct pci_dev *pdev = nv_device(bios)->pdev;

	int cnt = 65536 / 4096;

	int ret;

	int ret, cnt, i;

	u8  data[3];

	if (!nouveau_acpi_rom_supported(pdev))

		return;

	bios->data = kmalloc(65536, GFP_KERNEL);

	bios->size = 0;

	if (!bios->data)

		return;

	while (cnt--) {

		ret = nouveau_acpi_get_bios_chunk(bios->data, bios->size, 4096);

		if (ret != 4096)

			return;

	if (nouveau_acpi_get_bios_chunk(data, 0, 3) == 3)

		bios->size = data[2] * 512;

		bios->size += 4096;

	bios->data = kmalloc(bios->size, GFP_KERNEL);

	for (i = 0; bios->data && i < bios->size; i += cnt) {

		cnt = min((bios->size - i), (u32)4096);

		ret = nouveau_acpi_get_bios_chunk(bios->data, i, cnt);

		if (ret != cnt)

			break;

	}

}