x86: fix long standing bug with usb after hibernation with 4GB ram

aperture_64.c takes a piece of memory and makes it into iommu
window... but such window may not be saved by swsusp -- that leads to
oops during hibernation.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 608152a..00df126 100644 (file)
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -18,6 +18,7 @@
 #include <linux/pci.h>
 #include <linux/bitops.h>
 #include <linux/ioport.h>
+#include <linux/suspend.h>
 #include <asm/e820.h>
 #include <asm/io.h>
 #include <asm/gart.h>
@@ -76,6 +77,8 @@ static u32 __init allocate_aperture(void)
        printk(KERN_INFO "Mapping aperture over %d KB of RAM @ %lx\n",
                        aper_size >> 10, __pa(p));
        insert_aperture_resource((u32)__pa(p), aper_size);
+       register_nosave_region((u32)__pa(p) >> PAGE_SHIFT,
+                               (u32)__pa(p+aper_size) >> PAGE_SHIFT);
 
        return (u32)__pa(p);
 }