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Commit d431cbc5 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / sleep: Simplify sleep states sysfs interface code 



Simplify the sleep states sysfs interface /sys/power/state code by
redefining pm_states[] as an array of pointers to constant strings
such that only the entries corresponding to valid states are set.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 9a3c4145

kernel/power/main.c

+11 −10
Original line number Diff line number Diff line
@@ -296,8 +296,8 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, 
	suspend_state_t i;



	for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)

		if (pm_states[i].state)

			s += sprintf(s,"%s ", pm_states[i].label);

		if (pm_states[i])

			s += sprintf(s,"%s ", pm_states[i]);



#endif

	if (hibernation_available())
@@ -311,8 +311,7 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, 
static suspend_state_t decode_state(const char *buf, size_t n)

{

#ifdef CONFIG_SUSPEND

	suspend_state_t state = PM_SUSPEND_MIN;

	struct pm_sleep_state *s;

	suspend_state_t state;

#endif

	char *p;

	int len;
@@ -325,10 +324,12 @@ static suspend_state_t decode_state(const char *buf, size_t n) 
		return PM_SUSPEND_MAX;



#ifdef CONFIG_SUSPEND

	for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++)

		if (s->state && len == strlen(s->label)

		    && !strncmp(buf, s->label, len))

			return s->state;

	for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) {

		const char *label = pm_states[state];



		if (label && len == strlen(label) && !strncmp(buf, label, len))

			return state;

	}

#endif



	return PM_SUSPEND_ON;
@@ -446,8 +447,8 @@ static ssize_t autosleep_show(struct kobject *kobj, 


#ifdef CONFIG_SUSPEND

	if (state < PM_SUSPEND_MAX)

		return sprintf(buf, "%s\n", pm_states[state].state ?

					pm_states[state].label : "error");

		return sprintf(buf, "%s\n", pm_states[state] ?

					pm_states[state] : "error");

#endif

#ifdef CONFIG_HIBERNATION

	return sprintf(buf, "disk\n");

kernel/power/power.h

+1 −6
Original line number Diff line number Diff line
@@ -178,13 +178,8 @@ extern void swsusp_show_speed(struct timeval *, struct timeval *, 
				unsigned int, char *);



#ifdef CONFIG_SUSPEND

struct pm_sleep_state {

	const char *label;

	suspend_state_t state;

};



/* kernel/power/suspend.c */

extern struct pm_sleep_state pm_states[];

extern const char *pm_states[];



extern int suspend_devices_and_enter(suspend_state_t state);

#else /* !CONFIG_SUSPEND */

kernel/power/suspend.c

+13 −19
Original line number Diff line number Diff line
@@ -31,11 +31,8 @@ 


#include "power.h"



struct pm_sleep_state pm_states[PM_SUSPEND_MAX] = {

	[PM_SUSPEND_FREEZE] = { .label = "freeze", .state = PM_SUSPEND_FREEZE },

	[PM_SUSPEND_STANDBY] = { .label = "standby", },

	[PM_SUSPEND_MEM] = { .label = "mem", },

};

static const char *pm_labels[] = { "mem", "standby", "freeze", };

const char *pm_states[PM_SUSPEND_MAX];



static const struct platform_suspend_ops *suspend_ops;

static const struct platform_freeze_ops *freeze_ops;
@@ -97,10 +94,7 @@ static bool relative_states; 
static int __init sleep_states_setup(char *str)

{

	relative_states = !strncmp(str, "1", 1);

	if (relative_states) {

		pm_states[PM_SUSPEND_MEM].state = PM_SUSPEND_FREEZE;

		pm_states[PM_SUSPEND_FREEZE].state = 0;

	}

	pm_states[PM_SUSPEND_FREEZE] = pm_labels[relative_states ? 0 : 2];

	return 1;

}
@@ -113,20 +107,20 @@ __setup("relative_sleep_states=", sleep_states_setup); 
void suspend_set_ops(const struct platform_suspend_ops *ops)

{

	suspend_state_t i;

	int j = PM_SUSPEND_MAX - 1;

	int j = 0;



	lock_system_sleep();



	suspend_ops = ops;

	for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--)

		if (valid_state(i))

			pm_states[j--].state = i;

		else if (!relative_states)

			pm_states[j--].state = 0;

		if (valid_state(i)) {

			pm_states[i] = pm_labels[j++];

		} else if (!relative_states) {

			pm_states[i] = NULL;

			j++;

		}



	pm_states[j--].state = PM_SUSPEND_FREEZE;

	while (j >= PM_SUSPEND_MIN)

		pm_states[j--].state = 0;

	pm_states[PM_SUSPEND_FREEZE] = pm_labels[j];



	unlock_system_sleep();

}
@@ -395,7 +389,7 @@ static int enter_state(suspend_state_t state) 
	printk("done.\n");

	trace_suspend_resume(TPS("sync_filesystems"), 0, false);



	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state].label);

	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);

	error = suspend_prepare(state);

	if (error)

		goto Unlock;
@@ -404,7 +398,7 @@ static int enter_state(suspend_state_t state) 
		goto Finish;



	trace_suspend_resume(TPS("suspend_enter"), state, false);

	pr_debug("PM: Entering %s sleep\n", pm_states[state].label);

	pr_debug("PM: Entering %s sleep\n", pm_states[state]);

	pm_restrict_gfp_mask();

	error = suspend_devices_and_enter(state);

	pm_restore_gfp_mask();

kernel/power/suspend_test.c

+6 −6
Original line number Diff line number Diff line
@@ -92,13 +92,13 @@ static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state) 
	}



	if (state == PM_SUSPEND_MEM) {

		printk(info_test, pm_states[state].label);

		printk(info_test, pm_states[state]);

		status = pm_suspend(state);

		if (status == -ENODEV)

			state = PM_SUSPEND_STANDBY;

	}

	if (state == PM_SUSPEND_STANDBY) {

		printk(info_test, pm_states[state].label);

		printk(info_test, pm_states[state]);

		status = pm_suspend(state);

	}

	if (status < 0)
@@ -141,8 +141,8 @@ static int __init setup_test_suspend(char *value) 
	/* "=mem" ==> "mem" */

	value++;

	for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)

		if (!strcmp(pm_states[i].label, value)) {

			test_state = pm_states[i].state;

		if (!strcmp(pm_states[i], value)) {

			test_state = i;

			return 0;

		}
@@ -162,8 +162,8 @@ static int __init test_suspend(void) 
	/* PM is initialized by now; is that state testable? */

	if (test_state == PM_SUSPEND_ON)

		goto done;

	if (!pm_states[test_state].state) {

		printk(warn_bad_state, pm_states[test_state].label);

	if (!pm_states[test_state]) {

		printk(warn_bad_state, pm_states[test_state]);

		goto done;

	}