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Diffstat (limited to 'kernel/power/hibernate.c')
-rw-r--r--kernel/power/hibernate.c119
1 files changed, 48 insertions, 71 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index b4511b6d3ef..6d6d2887033 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -43,8 +43,6 @@ int in_suspend __nosavedata;
enum {
HIBERNATION_INVALID,
HIBERNATION_PLATFORM,
- HIBERNATION_TEST,
- HIBERNATION_TESTPROC,
HIBERNATION_SHUTDOWN,
HIBERNATION_REBOOT,
/* keep last */
@@ -55,6 +53,8 @@ enum {
static int hibernation_mode = HIBERNATION_SHUTDOWN;
+bool freezer_test_done;
+
static const struct platform_hibernation_ops *hibernation_ops;
/**
@@ -69,14 +69,14 @@ void hibernation_set_ops(const struct platform_hibernation_ops *ops)
WARN_ON(1);
return;
}
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
hibernation_ops = ops;
if (ops)
hibernation_mode = HIBERNATION_PLATFORM;
else if (hibernation_mode == HIBERNATION_PLATFORM)
hibernation_mode = HIBERNATION_SHUTDOWN;
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
}
static bool entering_platform_hibernation;
@@ -94,15 +94,6 @@ static void hibernation_debug_sleep(void)
mdelay(5000);
}
-static int hibernation_testmode(int mode)
-{
- if (hibernation_mode == mode) {
- hibernation_debug_sleep();
- return 1;
- }
- return 0;
-}
-
static int hibernation_test(int level)
{
if (pm_test_level == level) {
@@ -112,7 +103,6 @@ static int hibernation_test(int level)
return 0;
}
#else /* !CONFIG_PM_DEBUG */
-static int hibernation_testmode(int mode) { return 0; }
static int hibernation_test(int level) { return 0; }
#endif /* !CONFIG_PM_DEBUG */
@@ -276,8 +266,7 @@ static int create_image(int platform_mode)
goto Platform_finish;
error = disable_nonboot_cpus();
- if (error || hibernation_test(TEST_CPUS)
- || hibernation_testmode(HIBERNATION_TEST))
+ if (error || hibernation_test(TEST_CPUS))
goto Enable_cpus;
local_irq_disable();
@@ -331,7 +320,7 @@ static int create_image(int platform_mode)
*/
int hibernation_snapshot(int platform_mode)
{
- pm_message_t msg = PMSG_RECOVER;
+ pm_message_t msg;
int error;
error = platform_begin(platform_mode);
@@ -345,28 +334,40 @@ int hibernation_snapshot(int platform_mode)
error = freeze_kernel_threads();
if (error)
- goto Close;
+ goto Cleanup;
+
+ if (hibernation_test(TEST_FREEZER)) {
+
+ /*
+ * Indicate to the caller that we are returning due to a
+ * successful freezer test.
+ */
+ freezer_test_done = true;
+ goto Cleanup;
+ }
error = dpm_prepare(PMSG_FREEZE);
- if (error)
- goto Complete_devices;
+ if (error) {
+ dpm_complete(PMSG_RECOVER);
+ goto Cleanup;
+ }
suspend_console();
pm_restrict_gfp_mask();
+
error = dpm_suspend(PMSG_FREEZE);
- if (error)
- goto Recover_platform;
- if (hibernation_test(TEST_DEVICES))
- goto Recover_platform;
+ if (error || hibernation_test(TEST_DEVICES))
+ platform_recover(platform_mode);
+ else
+ error = create_image(platform_mode);
- error = create_image(platform_mode);
/*
- * Control returns here (1) after the image has been created or the
+ * In the case that we call create_image() above, the control
+ * returns here (1) after the image has been created or the
* image creation has failed and (2) after a successful restore.
*/
- Resume_devices:
/* We may need to release the preallocated image pages here. */
if (error || !in_suspend)
swsusp_free();
@@ -378,17 +379,15 @@ int hibernation_snapshot(int platform_mode)
pm_restore_gfp_mask();
resume_console();
-
- Complete_devices:
dpm_complete(msg);
Close:
platform_end(platform_mode);
return error;
- Recover_platform:
- platform_recover(platform_mode);
- goto Resume_devices;
+ Cleanup:
+ swsusp_free();
+ goto Close;
}
/**
@@ -573,9 +572,6 @@ int hibernation_platform_enter(void)
static void power_down(void)
{
switch (hibernation_mode) {
- case HIBERNATION_TEST:
- case HIBERNATION_TESTPROC:
- break;
case HIBERNATION_REBOOT:
kernel_restart(NULL);
break;
@@ -594,17 +590,6 @@ static void power_down(void)
while(1);
}
-static int prepare_processes(void)
-{
- int error = 0;
-
- if (freeze_processes()) {
- error = -EBUSY;
- thaw_processes();
- }
- return error;
-}
-
/**
* hibernate - Carry out system hibernation, including saving the image.
*/
@@ -612,7 +597,7 @@ int hibernate(void)
{
int error;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
/* The snapshot device should not be opened while we're running */
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
error = -EBUSY;
@@ -637,19 +622,17 @@ int hibernate(void)
sys_sync();
printk("done.\n");
- error = prepare_processes();
+ error = freeze_processes();
if (error)
goto Finish;
- if (hibernation_test(TEST_FREEZER))
- goto Thaw;
-
- if (hibernation_testmode(HIBERNATION_TESTPROC))
- goto Thaw;
-
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
if (error)
goto Thaw;
+ if (freezer_test_done) {
+ freezer_test_done = false;
+ goto Thaw;
+ }
if (in_suspend) {
unsigned int flags = 0;
@@ -682,7 +665,7 @@ int hibernate(void)
pm_restore_console();
atomic_inc(&snapshot_device_available);
Unlock:
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return error;
}
@@ -796,11 +779,13 @@ static int software_resume(void)
goto close_finish;
error = create_basic_memory_bitmaps();
- if (error)
+ if (error) {
+ usermodehelper_enable();
goto close_finish;
+ }
pr_debug("PM: Preparing processes for restore.\n");
- error = prepare_processes();
+ error = freeze_processes();
if (error) {
swsusp_close(FMODE_READ);
goto Done;
@@ -840,8 +825,6 @@ static const char * const hibernation_modes[] = {
[HIBERNATION_PLATFORM] = "platform",
[HIBERNATION_SHUTDOWN] = "shutdown",
[HIBERNATION_REBOOT] = "reboot",
- [HIBERNATION_TEST] = "test",
- [HIBERNATION_TESTPROC] = "testproc",
};
/*
@@ -850,17 +833,15 @@ static const char * const hibernation_modes[] = {
* Hibernation can be handled in several ways. There are a few different ways
* to put the system into the sleep state: using the platform driver (e.g. ACPI
* or other hibernation_ops), powering it off or rebooting it (for testing
- * mostly), or using one of the two available test modes.
+ * mostly).
*
* The sysfs file /sys/power/disk provides an interface for selecting the
* hibernation mode to use. Reading from this file causes the available modes
- * to be printed. There are 5 modes that can be supported:
+ * to be printed. There are 3 modes that can be supported:
*
* 'platform'
* 'shutdown'
* 'reboot'
- * 'test'
- * 'testproc'
*
* If a platform hibernation driver is in use, 'platform' will be supported
* and will be used by default. Otherwise, 'shutdown' will be used by default.
@@ -884,8 +865,6 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
switch (i) {
case HIBERNATION_SHUTDOWN:
case HIBERNATION_REBOOT:
- case HIBERNATION_TEST:
- case HIBERNATION_TESTPROC:
break;
case HIBERNATION_PLATFORM:
if (hibernation_ops)
@@ -914,7 +893,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
if (len == strlen(hibernation_modes[i])
&& !strncmp(buf, hibernation_modes[i], len)) {
@@ -926,8 +905,6 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
switch (mode) {
case HIBERNATION_SHUTDOWN:
case HIBERNATION_REBOOT:
- case HIBERNATION_TEST:
- case HIBERNATION_TESTPROC:
hibernation_mode = mode;
break;
case HIBERNATION_PLATFORM:
@@ -942,7 +919,7 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
if (!error)
pr_debug("PM: Hibernation mode set to '%s'\n",
hibernation_modes[mode]);
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
return error ? error : n;
}
@@ -969,9 +946,9 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
if (maj != MAJOR(res) || min != MINOR(res))
goto out;
- mutex_lock(&pm_mutex);
+ lock_system_sleep();
swsusp_resume_device = res;
- mutex_unlock(&pm_mutex);
+ unlock_system_sleep();
printk(KERN_INFO "PM: Starting manual resume from disk\n");
noresume = 0;
software_resume();
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-04 23:46:47 +0000