linux-kernel - Re: 2.6.25 -- long standing bug with usb after resume with 4GB ram

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Date:	Thu, 13 Mar 2008 23:05:41 +0100
From:	Pavel Machek <pavel@....cz>
To:	Greg KH <greg@...ah.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	stern@...land.harvard.edu, linux-usb@...r.kernel.org,
	oliver@...kum.name
Subject: Re: 2.6.25 -- long standing bug with usb after resume with 4GB ram

Hi!

> > There are problems with usb after suspend/resume... it works as long
> > as memory is limited to 3G -- probably because iommu/agpgart/something
> > is not used in such case.
> > 
> > rmmod/insmod of ehci_hcd & ohci_hcd fixes that.
> > 
> > For testing with 2.6.25, you'll need aperture_64.c patch that makes
> > iommu as nosave (or it oopses).
> 
> Any pointer to where this patch is?
> 
> Can it go into 2.6.25?

Here it is: Yes, I guess it could go into 2.6.25...
								Pavel


diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 608152a..88747f3 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -18,6 +18,7 @@ #include <linux/pci_ids.h>
 #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 +77,7 @@ 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);
 }


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