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PM: sleep: Use sysfs_emit() and sysfs_emit_at() in "show" functions

Browse Source 
As Documentation/filesystems/sysfs.rst suggested, show() should only use
sysfs_emit() or sysfs_emit_at() when formatting the value to be returned
to user space.

No functional change intended.

Signed-off-by: Xueqin Luo <luoxueqin@kylinos.cn>
Link: https://patch.msgid.link/20240801083156.2513508-3-luoxueqin@kylinos.cn
[ rjw: Subject edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Xueqin Luo 2024-08-01 16:31:56 +08:00 committed by Rafael J. Wysocki
parent 6306653cd8
commit a712f03fe8
1 changed files with 39 additions and 37 deletions
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76
kernel/power/main.c
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@ -115,7 +115,7 @@ int pm_async_enabled = 1;
static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", pm_async_enabled);
return sysfs_emit(buf, "%d\n", pm_async_enabled);
}
static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,
@ -139,7 +139,7 @@ power_attr(pm_async);
static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
char *s = buf;
ssize_t count = 0;
suspend_state_t i;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) {
@ -149,17 +149,17 @@ static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr,
const char *label = mem_sleep_states[i];
if (mem_sleep_current == i)
s += sprintf(s, "[%s] ", label);
count += sysfs_emit_at(buf, count, "[%s] ", label);
else
s += sprintf(s, "%s ", label);
count += sysfs_emit_at(buf, count, "%s ", label);
}
}
/* Convert the last space to a newline if needed. */
if (s != buf)
*(s-1) = '\n';
if (count > 0)
buf[count - 1] = '\n';
return (s - buf);
return count;
}
static suspend_state_t decode_suspend_state(const char *buf, size_t n)
@ -220,7 +220,7 @@ bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC);
static ssize_t sync_on_suspend_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", sync_on_suspend_enabled);
return sysfs_emit(buf, "%d\n", sync_on_suspend_enabled);
}
static ssize_t sync_on_suspend_store(struct kobject *kobj,
@ -257,22 +257,22 @@ static const char * const pm_tests[__TEST_AFTER_LAST] = {
static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
char *s = buf;
ssize_t count = 0;
int level;
for (level = TEST_FIRST; level <= TEST_MAX; level++)
if (pm_tests[level]) {
if (level == pm_test_level)
s += sprintf(s, "[%s] ", pm_tests[level]);
count += sysfs_emit_at(buf, count, "[%s] ", pm_tests[level]);
else
s += sprintf(s, "%s ", pm_tests[level]);
count += sysfs_emit_at(buf, count, "%s ", pm_tests[level]);
}
if (s != buf)
/* convert the last space to a newline */
*(s-1) = '\n';
/* Convert the last space to a newline if needed. */
if (count > 0)
buf[count - 1] = '\n';
return (s - buf);
return count;
}
static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
@ -390,7 +390,7 @@ static const char * const suspend_step_names[] = {
static ssize_t _name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf) \
{ \
return sprintf(buf, format_str, suspend_stats._name); \
return sysfs_emit(buf, format_str, suspend_stats._name);\
} \
static struct kobj_attribute _name = __ATTR_RO(_name)
@ -404,7 +404,7 @@ suspend_attr(max_hw_sleep, "%llu\n");
static ssize_t _name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf) \
{ \
return sprintf(buf, "%u\n", \
return sysfs_emit(buf, "%u\n", \
suspend_stats.step_failures[step-1]); \
} \
static struct kobj_attribute _name = __ATTR_RO(_name)
@ -428,7 +428,7 @@ static ssize_t last_failed_dev_show(struct kobject *kobj,
index %= REC_FAILED_NUM;
last_failed_dev = suspend_stats.failed_devs[index];
return sprintf(buf, "%s\n", last_failed_dev);
return sysfs_emit(buf, "%s\n", last_failed_dev);
}
static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev);
@ -442,7 +442,7 @@ static ssize_t last_failed_errno_show(struct kobject *kobj,
index %= REC_FAILED_NUM;
last_failed_errno = suspend_stats.errno[index];
return sprintf(buf, "%d\n", last_failed_errno);
return sysfs_emit(buf, "%d\n", last_failed_errno);
}
static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno);
@ -456,7 +456,7 @@ static ssize_t last_failed_step_show(struct kobject *kobj,
index %= REC_FAILED_NUM;
step = suspend_stats.failed_steps[index];
return sprintf(buf, "%s\n", suspend_step_names[step]);
return sysfs_emit(buf, "%s\n", suspend_step_names[step]);
}
static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step);
@ -571,7 +571,7 @@ bool pm_print_times_enabled;
static ssize_t pm_print_times_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", pm_print_times_enabled);
return sysfs_emit(buf, "%d\n", pm_print_times_enabled);
}
static ssize_t pm_print_times_store(struct kobject *kobj,
@ -604,7 +604,7 @@ static ssize_t pm_wakeup_irq_show(struct kobject *kobj,
if (!pm_wakeup_irq())
return -ENODATA;
return sprintf(buf, "%u\n", pm_wakeup_irq());
return sysfs_emit(buf, "%u\n", pm_wakeup_irq());
}
power_attr_ro(pm_wakeup_irq);
@ -620,7 +620,7 @@ EXPORT_SYMBOL_GPL(pm_debug_messages_should_print);
static ssize_t pm_debug_messages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", pm_debug_messages_on);
return sysfs_emit(buf, "%d\n", pm_debug_messages_on);
}
static ssize_t pm_debug_messages_store(struct kobject *kobj,
@ -668,21 +668,23 @@ struct kobject *power_kobj;
static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
char *s = buf;
ssize_t count = 0;
#ifdef CONFIG_SUSPEND
suspend_state_t i;
for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
if (pm_states[i])
s += sprintf(s,"%s ", pm_states[i]);
count += sysfs_emit_at(buf, count, "%s ", pm_states[i]);
#endif
if (hibernation_available())
s += sprintf(s, "disk ");
if (s != buf)
/* convert the last space to a newline */
*(s-1) = '\n';
return (s - buf);
count += sysfs_emit_at(buf, count, "disk ");
/* Convert the last space to a newline if needed. */
if (count > 0)
buf[count - 1] = '\n';
return count;
}
static suspend_state_t decode_state(const char *buf, size_t n)
@ -782,7 +784,7 @@ static ssize_t wakeup_count_show(struct kobject *kobj,
unsigned int val;
return pm_get_wakeup_count(&val, true) ?
sprintf(buf, "%u\n", val) : -EINTR;
sysfs_emit(buf, "%u\n", val) : -EINTR;
}
static ssize_t wakeup_count_store(struct kobject *kobj,
@ -824,17 +826,17 @@ static ssize_t autosleep_show(struct kobject *kobj,
suspend_state_t state = pm_autosleep_state();
if (state == PM_SUSPEND_ON)
return sprintf(buf, "off\n");
return sysfs_emit(buf, "off\n");
#ifdef CONFIG_SUSPEND
if (state < PM_SUSPEND_MAX)
return sprintf(buf, "%s\n", pm_states[state] ?
return sysfs_emit(buf, "%s\n", pm_states[state] ?
pm_states[state] : "error");
#endif
#ifdef CONFIG_HIBERNATION
return sprintf(buf, "disk\n");
return sysfs_emit(buf, "disk\n");
#else
return sprintf(buf, "error");
return sysfs_emit(buf, "error\n");
#endif
}
@ -903,7 +905,7 @@ int pm_trace_enabled;
static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", pm_trace_enabled);
return sysfs_emit(buf, "%d\n", pm_trace_enabled);
}
static ssize_t
@ -940,7 +942,7 @@ power_attr_ro(pm_trace_dev_match);
static ssize_t pm_freeze_timeout_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%u\n", freeze_timeout_msecs);
return sysfs_emit(buf, "%u\n", freeze_timeout_msecs);
}
static ssize_t pm_freeze_timeout_store(struct kobject *kobj,