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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index ed35a47..83f5b3e 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -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 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 @@
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 @@
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 @@
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();