diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/user.c | 92 |
1 files changed, 58 insertions, 34 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c index f7b7a785a5c6..4f217683455f 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -122,6 +122,59 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf, return res; } +static inline int snapshot_suspend(void) +{ + int error; + + mutex_lock(&pm_mutex); + /* Free memory before shutting down devices. */ + error = swsusp_shrink_memory(); + if (error) + goto Finish; + + suspend_console(); + error = device_suspend(PMSG_FREEZE); + if (error) + goto Resume_devices; + + error = disable_nonboot_cpus(); + if (!error) { + in_suspend = 1; + error = swsusp_suspend(); + } + enable_nonboot_cpus(); + Resume_devices: + device_resume(); + resume_console(); + Finish: + mutex_unlock(&pm_mutex); + return error; +} + +static inline int snapshot_restore(void) +{ + int error; + + mutex_lock(&pm_mutex); + pm_prepare_console(); + suspend_console(); + error = device_suspend(PMSG_PRETHAW); + if (error) + goto Resume_devices; + + error = disable_nonboot_cpus(); + if (!error) + error = swsusp_resume(); + + enable_nonboot_cpus(); + Resume_devices: + device_resume(); + resume_console(); + pm_restore_console(); + mutex_unlock(&pm_mutex); + return error; +} + static int snapshot_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { @@ -145,14 +198,9 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, if (data->frozen) break; mutex_lock(&pm_mutex); - error = disable_nonboot_cpus(); - if (!error) { - error = freeze_processes(); - if (error) { - thaw_processes(); - enable_nonboot_cpus(); - error = -EBUSY; - } + if (freeze_processes()) { + thaw_processes(); + error = -EBUSY; } mutex_unlock(&pm_mutex); if (!error) @@ -164,7 +212,6 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, break; mutex_lock(&pm_mutex); thaw_processes(); - enable_nonboot_cpus(); mutex_unlock(&pm_mutex); data->frozen = 0; break; @@ -174,20 +221,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, error = -EPERM; break; } - mutex_lock(&pm_mutex); - /* Free memory before shutting down devices. */ - error = swsusp_shrink_memory(); - if (!error) { - suspend_console(); - error = device_suspend(PMSG_FREEZE); - if (!error) { - in_suspend = 1; - error = swsusp_suspend(); - device_resume(); - } - resume_console(); - } - mutex_unlock(&pm_mutex); + error = snapshot_suspend(); if (!error) error = put_user(in_suspend, (unsigned int __user *)arg); if (!error) @@ -201,17 +235,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp, error = -EPERM; break; } - mutex_lock(&pm_mutex); - pm_prepare_console(); - suspend_console(); - error = device_suspend(PMSG_PRETHAW); - if (!error) { - error = swsusp_resume(); - device_resume(); - } - resume_console(); - pm_restore_console(); - mutex_unlock(&pm_mutex); + error = snapshot_restore(); break; case SNAPSHOT_FREE: |