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[PATCH] fix swsusp on machines not supporting S4

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Fix swsusp on machines not supporting S4.  With recent changes, it is not
possible to trigger it using /sys filesystem.  Swsusp does not really need
any support from low-level code, it is possible to reboot or halt at the
end of suspend.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pavel Machek 2005-11-29 19:34:37 -08:00 committed by Linus Torvalds
parent d91b14c463
commit 123d3c13e2
1 changed files with 16 additions and 5 deletions
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21
kernel/power/main.c
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@ -24,7 +24,7 @@
DECLARE_MUTEX(pm_sem);
struct pm_ops * pm_ops = NULL;
struct pm_ops *pm_ops;
suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
/**
@ -151,6 +151,18 @@ static char *pm_states[PM_SUSPEND_MAX] = {
#endif
};
static inline int valid_state(suspend_state_t state)
{
/* Suspend-to-disk does not really need low-level support.
* It can work with reboot if needed. */
if (state == PM_SUSPEND_DISK)
return 1;
if (pm_ops && pm_ops->valid && !pm_ops->valid(state))
return 0;
return 1;
}
/**
* enter_state - Do common work of entering low-power state.
@ -167,7 +179,7 @@ static int enter_state(suspend_state_t state)
{
int error;
if (pm_ops && pm_ops->valid && !pm_ops->valid(state))
if (!valid_state(state))
return -ENODEV;
if (down_trylock(&pm_sem))
return -EBUSY;
@ -238,9 +250,8 @@ static ssize_t state_show(struct subsystem * subsys, char * buf)
char * s = buf;
for (i = 0; i < PM_SUSPEND_MAX; i++) {
if (pm_states[i] && pm_ops && (!pm_ops->valid
||(pm_ops->valid && pm_ops->valid(i))))
s += sprintf(s,"%s ",pm_states[i]);
if (pm_states[i] && valid_state(i))
s += sprintf(s,"%s ", pm_states[i]);
}
s += sprintf(s,"\n");
return (s - buf);