1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kernel/probe_roms.c b/arch/x86/kernel/probe_roms.c
index ba0a4cce53be..63228035f9d7 100644
--- a/arch/x86/kernel/probe_roms.c
+++ b/arch/x86/kernel/probe_roms.c
@@ -234,7 +234,7 @@ void __init probe_roms(void)
         /* check for extension rom (ignore length byte!) */
         rom = isa_bus_to_virt(extension_rom_resource.start);
         if (romsignature(rom)) {
-                length = extension_rom_resource.end - extension_rom_resource.start + 1;
+                length = resource_size(&extension_rom_resource);
                 if (romchecksum(rom, length)) {
                         request_resource(&iomem_resource, &extension_rom_resource);
                         upper = extension_rom_resource.start;