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Revision 4b4f7280d7fd1feeff134c2cf2db32fd583b6c29 authored by H. Peter Anvin on 24 June 2008, 21:03:48 UTC, committed by Ingo Molnar on 05 July 2008, 06:25:40 UTC 
x86 ACPI: normalize segment descriptor register on resume
 
Some Dell laptops enter resume with apparent garbage in the segment
descriptor registers (almost certainly the result of a botched
transition from protected to real mode.)  The only way to clean that
up is to enter protected mode ourselves and clean out the descriptor
registers.

This fixes resume on Dell XPS M1210 and Dell D620.

Reference: http://bugzilla.kernel.org/show_bug.cgi?id=10927

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: pm list <linux-pm@lists.linux-foundation.org>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 parent b8a0b6c
Raw File
do_mounts.h 
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/mount.h>
#include <linux/major.h>
#include <linux/root_dev.h>

void  change_floppy(char *fmt, ...);
void  mount_block_root(char *name, int flags);
void  mount_root(void);
extern int root_mountflags;
extern char *root_device_name;

static inline int create_dev(char *name, dev_t dev)
{
	sys_unlink(name);
	return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev));
}

#if BITS_PER_LONG == 32
static inline u32 bstat(char *name)
{
	struct stat64 stat;
	if (sys_stat64(name, &stat) != 0)
		return 0;
	if (!S_ISBLK(stat.st_mode))
		return 0;
	if (stat.st_rdev != (u32)stat.st_rdev)
		return 0;
	return stat.st_rdev;
}
#else
static inline u32 bstat(char *name)
{
	struct stat stat;
	if (sys_newstat(name, &stat) != 0)
		return 0;
	if (!S_ISBLK(stat.st_mode))
		return 0;
	return stat.st_rdev;
}
#endif

#ifdef CONFIG_BLK_DEV_RAM

int __init rd_load_disk(int n);
int __init rd_load_image(char *from);

#else

static inline int rd_load_disk(int n) { return 0; }
static inline int rd_load_image(char *from) { return 0; }

#endif

#ifdef CONFIG_BLK_DEV_INITRD

int __init initrd_load(void);

#else

static inline int initrd_load(void) { return 0; }

#endif

#ifdef CONFIG_BLK_DEV_MD

void md_run_setup(void);

#else

static inline void md_run_setup(void) {}

#endif
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