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freezer: Have {,un}lock_system_sleep() save/restore flags

Browse Source 
Rafael explained that the reason for having both PF_NOFREEZE and
PF_FREEZER_SKIP is that {,un}lock_system_sleep() is callable from
kthread context that has previously called set_freezable().

In preparation of merging the flags, have {,un}lock_system_slee() save
and restore current->flags.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20220822114648.725003428@infradead.org
This commit is contained in:
Peter Zijlstra 2022-08-22 13:18:17 +02:00
parent 0b9d46fc5e
commit 5950e5d574
7 changed files with 72 additions and 46 deletions
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12
drivers/acpi/x86/s2idle.c
View File

@ -541,12 +541,14 @@ void acpi_s2idle_setup(void)
int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
{
unsigned int sleep_flags;
if (!lps0_device_handle || sleep_no_lps0)
return -ENODEV;
lock_system_sleep();
sleep_flags = lock_system_sleep();
list_add(&arg->list_node, &lps0_s2idle_devops_head);
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return 0;
}
@ -554,12 +556,14 @@ EXPORT_SYMBOL_GPL(acpi_register_lps0_dev);
void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg)
{
unsigned int sleep_flags;
if (!lps0_device_handle || sleep_no_lps0)
return;
lock_system_sleep();
sleep_flags = lock_system_sleep();
list_del(&arg->list_node);
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
}
EXPORT_SYMBOL_GPL(acpi_unregister_lps0_dev);

7
drivers/scsi/scsi_transport_spi.c
View File

@ -998,8 +998,9 @@ void
spi_dv_device(struct scsi_device *sdev)
{
struct scsi_target *starget = sdev->sdev_target;
u8 *buffer;
const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
unsigned int sleep_flags;
u8 *buffer;
/*
* Because this function and the power management code both call
@ -1007,7 +1008,7 @@ spi_dv_device(struct scsi_device *sdev)
* while suspend or resume is in progress. Hence the
* lock/unlock_system_sleep() calls.
*/
lock_system_sleep();
sleep_flags = lock_system_sleep();
if (scsi_autopm_get_device(sdev))
goto unlock_system_sleep;
@ -1058,7 +1059,7 @@ put_autopm:
scsi_autopm_put_device(sdev);
unlock_system_sleep:
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
}
EXPORT_SYMBOL(spi_dv_device);

8
include/linux/suspend.h
View File

@ -510,8 +510,8 @@ extern bool pm_save_wakeup_count(unsigned int count);
extern void pm_wakep_autosleep_enabled(bool set);
extern void pm_print_active_wakeup_sources(void);
extern void lock_system_sleep(void);
extern void unlock_system_sleep(void);
extern unsigned int lock_system_sleep(void);
extern void unlock_system_sleep(unsigned int);
#else /* !CONFIG_PM_SLEEP */
@ -534,8 +534,8 @@ static inline void pm_system_wakeup(void) {}
static inline void pm_wakeup_clear(bool reset) {}
static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
static inline void lock_system_sleep(void) {}
static inline void unlock_system_sleep(void) {}
static inline unsigned int lock_system_sleep(void) { return 0; }
static inline void unlock_system_sleep(unsigned int flags) {}
#endif /* !CONFIG_PM_SLEEP */

35
kernel/power/hibernate.c
View File

@ -92,20 +92,24 @@ bool hibernation_available(void)
*/
void hibernation_set_ops(const struct platform_hibernation_ops *ops)
{
unsigned int sleep_flags;
if (ops && !(ops->begin && ops->end && ops->pre_snapshot
&& ops->prepare && ops->finish && ops->enter && ops->pre_restore
&& ops->restore_cleanup && ops->leave)) {
WARN_ON(1);
return;
}
lock_system_sleep();
sleep_flags = lock_system_sleep();
hibernation_ops = ops;
if (ops)
hibernation_mode = HIBERNATION_PLATFORM;
else if (hibernation_mode == HIBERNATION_PLATFORM)
hibernation_mode = HIBERNATION_SHUTDOWN;
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
}
EXPORT_SYMBOL_GPL(hibernation_set_ops);
@ -713,6 +717,7 @@ static int load_image_and_restore(void)
int hibernate(void)
{
bool snapshot_test = false;
unsigned int sleep_flags;
int error;
if (!hibernation_available()) {
@ -720,7 +725,7 @@ int hibernate(void)
return -EPERM;
}
lock_system_sleep();
sleep_flags = lock_system_sleep();
/* The snapshot device should not be opened while we're running */
if (!hibernate_acquire()) {
error = -EBUSY;
@ -794,7 +799,7 @@ int hibernate(void)
pm_restore_console();
hibernate_release();
Unlock:
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
pr_info("hibernation exit\n");
return error;
@ -809,9 +814,10 @@ int hibernate(void)
*/
int hibernate_quiet_exec(int (*func)(void *data), void *data)
{
unsigned int sleep_flags;
int error;
lock_system_sleep();
sleep_flags = lock_system_sleep();
if (!hibernate_acquire()) {
error = -EBUSY;
@ -891,7 +897,7 @@ restore:
hibernate_release();
unlock:
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return error;
}
@ -1100,11 +1106,12 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
int mode = HIBERNATION_INVALID;
unsigned int sleep_flags;
int error = 0;
int i;
int len;
char *p;
int mode = HIBERNATION_INVALID;
int i;
if (!hibernation_available())
return -EPERM;
@ -1112,7 +1119,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
lock_system_sleep();
sleep_flags = lock_system_sleep();
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
if (len == strlen(hibernation_modes[i])
&& !strncmp(buf, hibernation_modes[i], len)) {
@ -1142,7 +1149,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
if (!error)
pm_pr_dbg("Hibernation mode set to '%s'\n",
hibernation_modes[mode]);
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return error ? error : n;
}
@ -1158,9 +1165,10 @@ static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
dev_t res;
unsigned int sleep_flags;
int len = n;
char *name;
dev_t res;
if (len && buf[len-1] == '\n')
len--;
@ -1173,9 +1181,10 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
if (!res)
return -EINVAL;
lock_system_sleep();
sleep_flags = lock_system_sleep();
swsusp_resume_device = res;
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
pm_pr_dbg("Configured hibernation resume from disk to %u\n",
swsusp_resume_device);
noresume = 0;

16
kernel/power/main.c
View File

@ -21,14 +21,16 @@
#ifdef CONFIG_PM_SLEEP
void lock_system_sleep(void)
unsigned int lock_system_sleep(void)
{
unsigned int flags = current->flags;
current->flags |= PF_FREEZER_SKIP;
mutex_lock(&system_transition_mutex);
return flags;
}
EXPORT_SYMBOL_GPL(lock_system_sleep);
void unlock_system_sleep(void)
void unlock_system_sleep(unsigned int flags)
{
/*
* Don't use freezer_count() because we don't want the call to
@ -46,7 +48,8 @@ void unlock_system_sleep(void)
* Which means, if we use try_to_freeze() here, it would make them
* enter the refrigerator, thus causing hibernation to lockup.
*/
current->flags &= ~PF_FREEZER_SKIP;
if (!(flags & PF_FREEZER_SKIP))
current->flags &= ~PF_FREEZER_SKIP;
mutex_unlock(&system_transition_mutex);
}
EXPORT_SYMBOL_GPL(unlock_system_sleep);
@ -263,16 +266,17 @@ static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t n)
{
unsigned int sleep_flags;
const char * const *s;
int error = -EINVAL;
int level;
char *p;
int len;
int error = -EINVAL;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
lock_system_sleep();
sleep_flags = lock_system_sleep();
level = TEST_FIRST;
for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
@ -282,7 +286,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
break;
}
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return error ? error : n;
}

12
kernel/power/suspend.c
View File

@ -75,9 +75,11 @@ EXPORT_SYMBOL_GPL(pm_suspend_default_s2idle);
void s2idle_set_ops(const struct platform_s2idle_ops *ops)
{
lock_system_sleep();
unsigned int sleep_flags;
sleep_flags = lock_system_sleep();
s2idle_ops = ops;
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
}
static void s2idle_begin(void)
@ -200,7 +202,9 @@ __setup("mem_sleep_default=", mem_sleep_default_setup);
*/
void suspend_set_ops(const struct platform_suspend_ops *ops)
{
lock_system_sleep();
unsigned int sleep_flags;
sleep_flags = lock_system_sleep();
suspend_ops = ops;
@ -216,7 +220,7 @@ void suspend_set_ops(const struct platform_suspend_ops *ops)
mem_sleep_current = PM_SUSPEND_MEM;
}
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
}
EXPORT_SYMBOL_GPL(suspend_set_ops);

28
kernel/power/user.c
View File

@ -47,12 +47,13 @@ int is_hibernate_resume_dev(dev_t dev)
static int snapshot_open(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
unsigned int sleep_flags;
int error;
if (!hibernation_available())
return -EPERM;
lock_system_sleep();
sleep_flags = lock_system_sleep();
if (!hibernate_acquire()) {
error = -EBUSY;
@ -98,7 +99,7 @@ static int snapshot_open(struct inode *inode, struct file *filp)
data->dev = 0;
Unlock:
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return error;
}
@ -106,8 +107,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
static int snapshot_release(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
unsigned int sleep_flags;
lock_system_sleep();
sleep_flags = lock_system_sleep();
swsusp_free();
data = filp->private_data;
@ -124,7 +126,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
PM_POST_HIBERNATION : PM_POST_RESTORE);
hibernate_release();
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return 0;
}
@ -132,11 +134,12 @@ static int snapshot_release(struct inode *inode, struct file *filp)
static ssize_t snapshot_read(struct file *filp, char __user *buf,
size_t count, loff_t *offp)
{
struct snapshot_data *data;
ssize_t res;
loff_t pg_offp = *offp & ~PAGE_MASK;
struct snapshot_data *data;
unsigned int sleep_flags;
ssize_t res;
lock_system_sleep();
sleep_flags = lock_system_sleep();
data = filp->private_data;
if (!data->ready) {
@ -157,7 +160,7 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
*offp += res;
Unlock:
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return res;
}
@ -165,16 +168,17 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
static ssize_t snapshot_write(struct file *filp, const char __user *buf,
size_t count, loff_t *offp)
{
struct snapshot_data *data;
ssize_t res;
loff_t pg_offp = *offp & ~PAGE_MASK;
struct snapshot_data *data;
unsigned long sleep_flags;
ssize_t res;
if (need_wait) {
wait_for_device_probe();
need_wait = false;
}
lock_system_sleep();
sleep_flags = lock_system_sleep();
data = filp->private_data;
@ -196,7 +200,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
if (res > 0)
*offp += res;
unlock:
unlock_system_sleep();
unlock_system_sleep(sleep_flags);
return res;
}