Commit d90aa92c authored by Lin Ming's avatar Lin Ming Committed by Len Brown
Browse files

acpi: fix _OSI string setup regression 



commit b0ed7a91(ACPICA/ACPI: Add new host interfaces for _OSI suppor)
introduced a regression that _OSI string setup fails.

There are 2 paths to setup _OSI string.

DMI:
acpi_dmi_osi_linux -> set_osi_linux -> acpi_osi_setup -> copy _OSI
string to osi_setup_string

Boot command line:
acpi_osi_setup -> copy _OSI string to osi_setup_string

Later, acpi_osi_setup_late will be called to handle osi_setup_string.
If _OSI string is "Linux" or "!Linux", then the call path is,

acpi_osi_setup_late -> acpi_cmdline_osi_linux -> set_osi_linux ->
acpi_osi_setup -> copy _OSI string to osi_setup_string

This actually never installs _OSI string(acpi_install_interface not
called), but just copy the _OSI string to osi_setup_string.

This patch fixes the regression.

Reported-and-tested-by: default avatarLukas Hejtmanek <xhejtman@ics.muni.cz>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent cf7d7e5a

drivers/acpi/osl.c

+33 −26
Original line number Diff line number Diff line
@@ -152,8 +152,7 @@ static struct osi_linux { 
	unsigned int	enable:1;

	unsigned int	dmi:1;

	unsigned int	cmdline:1;

	unsigned int	known:1;

} osi_linux = { 0, 0, 0, 0};

} osi_linux = {0, 0, 0};



static u32 acpi_osi_handler(acpi_string interface, u32 supported)

{
@@ -1055,13 +1054,22 @@ static int __init acpi_os_name_setup(char *str) 


__setup("acpi_os_name=", acpi_os_name_setup);



void __init acpi_osi_setup(char *str)

{

	if (!acpi_gbl_create_osi_method)

		return;



	if (str == NULL || *str == '\0') {

		printk(KERN_INFO PREFIX "_OSI method disabled\n");

		acpi_gbl_create_osi_method = FALSE;

	} else

		strncpy(osi_setup_string, str, OSI_STRING_LENGTH_MAX);

}



static void __init set_osi_linux(unsigned int enable)

{

	if (osi_linux.enable != enable) {

	if (osi_linux.enable != enable)

		osi_linux.enable = enable;

		printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n",

			enable ? "Add": "Delet");

	}



	if (osi_linux.enable)

		acpi_osi_setup("Linux");
@@ -1073,7 +1081,8 @@ static void __init set_osi_linux(unsigned int enable) 


static void __init acpi_cmdline_osi_linux(unsigned int enable)

{

	osi_linux.cmdline = 1;	/* cmdline set the default */

	osi_linux.cmdline = 1;	/* cmdline set the default and override DMI */

	osi_linux.dmi = 0;

	set_osi_linux(enable);



	return;
@@ -1081,15 +1090,12 @@ static void __init acpi_cmdline_osi_linux(unsigned int enable) 


void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d)

{

	osi_linux.dmi = 1;	/* DMI knows that this box asks OSI(Linux) */



	printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);



	if (enable == -1)

		return;



	osi_linux.known = 1;	/* DMI knows which OSI(Linux) default needed */



	osi_linux.dmi = 1;	/* DMI knows that this box asks OSI(Linux) */

	set_osi_linux(enable);



	return;
@@ -1105,36 +1111,37 @@ void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) 
static void __init acpi_osi_setup_late(void)

{

	char *str = osi_setup_string;

	acpi_status status;



	if (*str == '\0')

		return;



	if (!strcmp("!Linux", str)) {

		acpi_cmdline_osi_linux(0);	/* !enable */

	} else if (*str == '!') {

		if (acpi_remove_interface(++str) == AE_OK)

	if (*str == '!') {

		status = acpi_remove_interface(++str);



		if (ACPI_SUCCESS(status))

			printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str);

	} else if (!strcmp("Linux", str)) {

		acpi_cmdline_osi_linux(1);	/* enable */

	} else {

		if (acpi_install_interface(str) == AE_OK)

		status = acpi_install_interface(str);



		if (ACPI_SUCCESS(status))

			printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str);

	}

}



int __init acpi_osi_setup(char *str)

static int __init osi_setup(char *str)

{

	if (str == NULL || *str == '\0') {

		printk(KERN_INFO PREFIX "_OSI method disabled\n");

		acpi_gbl_create_osi_method = FALSE;

	} else {

		strncpy(osi_setup_string, str, OSI_STRING_LENGTH_MAX);

	}

	if (str && !strcmp("Linux", str))

		acpi_cmdline_osi_linux(1);

	else if (str && !strcmp("!Linux", str))

		acpi_cmdline_osi_linux(0);

	else

		acpi_osi_setup(str);



	return 1;

}



__setup("acpi_osi=", acpi_osi_setup);

__setup("acpi_osi=", osi_setup);



/* enable serialization to combat AE_ALREADY_EXISTS errors */

static int __init acpi_serialize_setup(char *str)

include/linux/acpi.h

+1 −1
Original line number Diff line number Diff line
@@ -219,7 +219,7 @@ static inline int acpi_video_display_switch_support(void) 


extern int acpi_blacklisted(void);

extern void acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d);

extern int acpi_osi_setup(char *str);

extern void acpi_osi_setup(char *str);



#ifdef CONFIG_ACPI_NUMA

int acpi_get_pxm(acpi_handle handle);

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