diff options
| -rw-r--r-- | drivers/acpi/thermal.c | 24 | ||||
| -rw-r--r-- | drivers/sbus/char/bbc_envctrl.c | 5 | ||||
| -rw-r--r-- | drivers/sbus/char/envctrl.c | 7 | ||||
| -rw-r--r-- | include/linux/reboot.h | 5 | ||||
| -rw-r--r-- | kernel/sys.c | 58 | ||||
| -rw-r--r-- | kernel/sysctl.c | 10 |
6 files changed, 79 insertions, 30 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; } diff --git a/drivers/sbus/char/bbc_envctrl.c b/drivers/sbus/char/bbc_envctrl.c index a54e4140683a..e821a155b658 100644 --- a/drivers/sbus/char/bbc_envctrl.c +++ b/drivers/sbus/char/bbc_envctrl.c @@ -7,6 +7,7 @@ #include <linux/kthread.h> #include <linux/delay.h> #include <linux/kmod.h> +#include <linux/reboot.h> #include <asm/oplib.h> #include <asm/ebus.h> @@ -170,8 +171,6 @@ static void get_current_temps(struct bbc_cpu_temperature *tp) static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp) { static int shutting_down = 0; - static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; - char *argv[] = { "/sbin/shutdown", "-h", "now", NULL }; char *type = "???"; s8 val = -1; @@ -195,7 +194,7 @@ static void do_envctrl_shutdown(struct bbc_cpu_temperature *tp) printk(KERN_CRIT "kenvctrld: Shutting down the system now.\n"); shutting_down = 1; - if (call_usermodehelper("/sbin/shutdown", argv, envp, 0) < 0) + if (orderly_poweroff(true) < 0) printk(KERN_CRIT "envctrl: shutdown execution failed\n"); } diff --git a/drivers/sbus/char/envctrl.c b/drivers/sbus/char/envctrl.c index 8328acab47fd..dadabef116b6 100644 --- a/drivers/sbus/char/envctrl.c +++ b/drivers/sbus/char/envctrl.c @@ -26,6 +26,7 @@ #include <linux/ioport.h> #include <linux/miscdevice.h> #include <linux/kmod.h> +#include <linux/reboot.h> #include <asm/ebus.h> #include <asm/uaccess.h> @@ -966,10 +967,6 @@ static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type) static void envctrl_do_shutdown(void) { static int inprog = 0; - static char *envp[] = { - "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; - char *argv[] = { - "/sbin/shutdown", "-h", "now", NULL }; int ret; if (inprog != 0) @@ -977,7 +974,7 @@ static void envctrl_do_shutdown(void) inprog = 1; printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n"); - ret = call_usermodehelper("/sbin/shutdown", argv, envp, 0); + ret = orderly_poweroff(true); if (ret < 0) { printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n"); inprog = 0; /* unlikely to succeed, but we could try again */ diff --git a/include/linux/reboot.h b/include/linux/reboot.h index 1dd1c707311f..85ea63f462af 100644 --- a/include/linux/reboot.h +++ b/include/linux/reboot.h @@ -67,6 +67,11 @@ extern void kernel_power_off(void); void ctrl_alt_del(void); +#define POWEROFF_CMD_PATH_LEN 256 +extern char poweroff_cmd[POWEROFF_CMD_PATH_LEN]; + +extern int orderly_poweroff(bool force); + /* * Emergency restart, callable from an interrupt handler. */ diff --git a/kernel/sys.c b/kernel/sys.c index 4d141ae3e802..aeded9ad66ce 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2286,3 +2286,61 @@ asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep, } return err ? -EFAULT : 0; } + +char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; + +static void argv_cleanup(char **argv, char **envp) +{ + argv_free(argv); +} + +/** + * orderly_poweroff - Trigger an orderly system poweroff + * @force: force poweroff if command execution fails + * + * This may be called from any context to trigger a system shutdown. + * If the orderly shutdown fails, it will force an immediate shutdown. + */ +int orderly_poweroff(bool force) +{ + int argc; + char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); + static char *envp[] = { + "HOME=/", + "PATH=/sbin:/bin:/usr/sbin:/usr/bin", + NULL + }; + int ret = -ENOMEM; + struct subprocess_info *info; + + if (argv == NULL) { + printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", + __func__, poweroff_cmd); + goto out; + } + + info = call_usermodehelper_setup(argv[0], argv, envp); + if (info == NULL) { + argv_free(argv); + goto out; + } + + call_usermodehelper_setcleanup(info, argv_cleanup); + + ret = call_usermodehelper_exec(info, -1); + + out: + if (ret && force) { + printk(KERN_WARNING "Failed to start orderly shutdown: " + "forcing the issue\n"); + + /* I guess this should try to kick off some daemon to + sync and poweroff asap. Or not even bother syncing + if we're doing an emergency shutdown? */ + emergency_sync(); + kernel_power_off(); + } + + return ret; +} +EXPORT_SYMBOL_GPL(orderly_poweroff); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 7063ebc6db05..44a1d699aad7 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -46,6 +46,7 @@ #include <linux/syscalls.h> #include <linux/nfs_fs.h> #include <linux/acpi.h> +#include <linux/reboot.h> #include <asm/uaccess.h> #include <asm/processor.h> @@ -705,6 +706,15 @@ static ctl_table kern_table[] = { .proc_handler = &proc_dointvec, }, #endif + { + .ctl_name = CTL_UNNUMBERED, + .procname = "poweroff_cmd", + .data = &poweroff_cmd, + .maxlen = POWEROFF_CMD_PATH_LEN, + .mode = 0644, + .proc_handler = &proc_dostring, + .strategy = &sysctl_string, + }, { .ctl_name = 0 } }; |