x86: aperture_64.c: corner case wrong

If

fix == 0, aper_enabled == 1, gart_fix_e820 == 0

	if (!fix && !aper_enabled)
		return;

	if (gart_fix_e820 && !fix && aper_enabled) {
		if (e820_any_mapped(aper_base, aper_base + aper_size,
				    E820_RAM)) {
			/* reserve it, so we can reuse it in second kernel */
			printk(KERN_INFO "update e820 for GART\n");
			add_memory_region(aper_base, aper_size, E820_RESERVED);
			update_e820();
		}
		return;
	}

	/* different nodes have different setting, disable them all atfirst*/

we'll fall back here and disable all the settings, even when they were
all consistent.

What about this? (I hope it compiles...)
Signed-off-by: NPavel Machek <pavel@suse.cz>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/aperture_64.c

@@ -331,9 +331,11 @@ void __init early_gart_iommu_check(void)
 			add_memory_region(aper_base, aper_size, E820_RESERVED);
 			update_e820();
 		}
-		return;
 	}
 
+	if (!fix)
+		return;
+
 	/* different nodes have different setting, disable them all at first*/
 	for (i = 0; i < ARRAY_SIZE(bus_dev_ranges); i++) {
 		int bus;