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[PATCH] properly stop devices before poweroff 

Without this patch, Linux provokes emergency disk shutdowns and
similar nastiness. It was in SuSE kernels for some time, IIRC.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pavel Machek 2005-06-25 14:55:11 -07:00 committed by Linus Torvalds
parent 5ce47e59c9
commit 620b032764
2 changed files with 24 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
include/linux/pm.h
View File

@ -103,7 +103,8 @@ extern int pm_active;
/*
* Register a device with power management
*/
struct pm_dev __deprecated *pm_register(pm_dev_t type, unsigned long id, pm_callback callback);
struct pm_dev __deprecated *
pm_register(pm_dev_t type, unsigned long id, pm_callback callback);
/*
* Unregister a device with power management
@ -190,17 +191,18 @@ typedef u32 __bitwise pm_message_t;
/*
* There are 4 important states driver can be in:
* ON -- driver is working
* FREEZE -- stop operations and apply whatever policy is applicable to a suspended driver
* of that class, freeze queues for block like IDE does, drop packets for
* ethernet, etc... stop DMA engine too etc... so a consistent image can be
* saved; but do not power any hardware down.
* SUSPEND - like FREEZE, but hardware is doing as much powersaving as possible. Roughly
* pci D3.
* FREEZE -- stop operations and apply whatever policy is applicable to a
* suspended driver of that class, freeze queues for block like IDE
* does, drop packets for ethernet, etc... stop DMA engine too etc...
* so a consistent image can be saved; but do not power any hardware
* down.
* SUSPEND - like FREEZE, but hardware is doing as much powersaving as
* possible. Roughly pci D3.
*
* Unfortunately, current drivers only recognize numeric values 0 (ON) and 3 (SUSPEND).
* We'll need to fix the drivers. So yes, putting 3 to all diferent defines is intentional,
* and will go away as soon as drivers are fixed. Also note that typedef is neccessary,
* we'll probably want to switch to
* Unfortunately, current drivers only recognize numeric values 0 (ON) and 3
* (SUSPEND). We'll need to fix the drivers. So yes, putting 3 to all different
* defines is intentional, and will go away as soon as drivers are fixed. Also
* note that typedef is neccessary, we'll probably want to switch to
* typedef struct pm_message_t { int event; int flags; } pm_message_t
* or something similar soon.
*/
@ -222,11 +224,18 @@ struct dev_pm_info {
extern void device_pm_set_parent(struct device * dev, struct device * parent);
extern int device_suspend(pm_message_t state);
extern int device_power_down(pm_message_t state);
extern void device_power_up(void);
extern void device_resume(void);
#ifdef CONFIG_PM
extern int device_suspend(pm_message_t state);
#else
static inline int device_suspend(pm_message_t state)
{
return 0;
}
#endif
#endif /* __KERNEL__ */

3
kernel/sys.c
View File

@ -405,6 +405,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
case LINUX_REBOOT_CMD_HALT:
notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
system_state = SYSTEM_HALT;
device_suspend(PMSG_SUSPEND);
device_shutdown();
printk(KERN_EMERG "System halted.\n");
machine_halt();
@ -415,6 +416,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
case LINUX_REBOOT_CMD_POWER_OFF:
notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
system_state = SYSTEM_POWER_OFF;
device_suspend(PMSG_SUSPEND);
device_shutdown();
printk(KERN_EMERG "Power down.\n");
machine_power_off();
@ -431,6 +433,7 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
system_state = SYSTEM_RESTART;
device_suspend(PMSG_FREEZE);
device_shutdown();
printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
machine_restart(buffer);