Add common orderly_poweroff()

Various pieces of code around the kernel want to be able to trigger an
orderly poweroff.  This pulls them together into a single
implementation.

By default the poweroff command is /sbin/poweroff, but it can be set
via sysctl: kernel/poweroff_cmd.  This is split at whitespace, so it
can include command-line arguments.

This patch replaces four other instances of invoking either "poweroff"
or "shutdown -h now": two sbus drivers, and acpi thermal
management.

sparc64 has its own "powerd"; still need to determine whether it should
be replaced by orderly_poweroff().

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Len Brown <lenb@kernel.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 22 deletions

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 88a6fc7fd271..58f1338981bc 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -40,6 +40,7 @@
 #include <linux/jiffies.h>
 #include <linux/kmod.h>
 #include <linux/seq_file.h>
+#include <linux/reboot.h>
 #include <asm/uaccess.h>
 
 #include <acpi/acpi_bus.h>
@@ -59,7 +60,6 @@
 #define ACPI_THERMAL_NOTIFY_CRITICAL    0xF0
 #define ACPI_THERMAL_NOTIFY_HOT         0xF1
 #define ACPI_THERMAL_MODE_ACTIVE        0x00
-#define ACPI_THERMAL_PATH_POWEROFF      "/sbin/poweroff"
 
 #define ACPI_THERMAL_MAX_ACTIVE 10
 #define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
@@ -419,26 +419,6 @@ static int acpi_thermal_get_devices(struct acpi_thermal *tz)
         return 0;
 }
 
-static int acpi_thermal_call_usermode(char *path)
-{
-        char *argv[2] = { NULL, NULL };
-        char *envp[3] = { NULL, NULL, NULL };
-
-
-        if (!path)
-                return -EINVAL;
-
-        argv[0] = path;
-
-        /* minimal command environment */
-        envp[0] = "HOME=/";
-        envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
-
-        call_usermodehelper(argv[0], argv, envp, 0);
-
-        return 0;
-}
-
 static int acpi_thermal_critical(struct acpi_thermal *tz)
 {
         if (!tz || !tz->trips.critical.flags.valid)
@@ -456,7 +436,7 @@ static int acpi_thermal_critical(struct acpi_thermal *tz)
         acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
                                 tz->trips.critical.flags.enabled);
 
-        acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);
+        orderly_poweroff(true);
 
         return 0;
 }