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PM / sleep: Simplify sleep states sysfs interface code

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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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2014-07-15 22:02:11 +02:00
parent 9a3c4145af
commit d431cbc53c
4 changed files with 31 additions and 41 deletions
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32
kernel/power/suspend.c
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@@ -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();