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[PATCH] x86_64: Clean up and tweak ACPI blacklist year code

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- Move the core parser into dmi_scan.c.  It can be useful for other
   subsystems too.
 - Differentiate between field doesn't exist and field is 0 or
   unparseable.  The first case is likely an old BIOS with broken ACPI,
   the later is likely a slightly buggy BIOS where someone forget to
   edit the date.  Don't blacklist in the later case.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-03-25 16:30:19 +01:00 committed by Linus Torvalds
parent e6fc99c6ab
commit f083a329e6
3 changed files with 38 additions and 21 deletions
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30
arch/i386/kernel/dmi_scan.c
View file

@ -299,3 +299,33 @@ struct dmi_device * dmi_find_device(int type, const char *name,
return NULL;
}
EXPORT_SYMBOL(dmi_find_device);
/**
* dmi_get_year - Return year of a DMI date
* @field: data index (like dmi_get_system_info)
*
* Returns -1 when the field doesn't exist. 0 when it is broken.
*/
int dmi_get_year(int field)
{
int year;
char *s = dmi_get_system_info(field);
if (!s)
return -1;
if (*s == '\0')
return 0;
s = strrchr(s, '/');
if (!s)
return 0;
s += 1;
year = simple_strtoul(s, NULL, 0);
if (year && year < 100) { /* 2-digit year */
year += 1900;
if (year < 1996) /* no dates < spec 1.0 */
year += 100;
}
return year;
}

27
drivers/acpi/blacklist.c
View file

@ -77,28 +77,13 @@ static struct acpi_blacklist_item acpi_blacklist[] __initdata = {
static int __init blacklist_by_year(void)
{
int year;
char *s = dmi_get_system_info(DMI_BIOS_DATE);
if (!s)
int year = dmi_get_year(DMI_BIOS_DATE);
/* Doesn't exist? Likely an old system */
if (year == -1)
return 1;
/* 0? Likely a buggy new BIOS */
if (year == 0)
return 0;
if (!*s)
return 0;
s = strrchr(s, '/');
if (!s)
return 0;
s += 1;
year = simple_strtoul(s, NULL, 0);
if (year < 100) { /* 2-digit year */
year += 1900;
if (year < 1996) /* no dates < spec 1.0 */
year += 100;
}
if (year < CONFIG_ACPI_BLACKLIST_YEAR) {
printk(KERN_ERR PREFIX "BIOS age (%d) fails cutoff (%d), "
"acpi=force is required to enable ACPI\n",

2
include/linux/dmi.h
View file

@ -68,6 +68,7 @@ extern char * dmi_get_system_info(int field);
extern struct dmi_device * dmi_find_device(int type, const char *name,
struct dmi_device *from);
extern void dmi_scan_machine(void);
extern int dmi_get_year(int field);
#else
@ -75,6 +76,7 @@ static inline int dmi_check_system(struct dmi_system_id *list) { return 0; }
static inline char * dmi_get_system_info(int field) { return NULL; }
static inline struct dmi_device * dmi_find_device(int type, const char *name,
struct dmi_device *from) { return NULL; }
static inline int dmi_get_year(int year) { return 0; }
#endif