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authorRafael J. Wysocki <rjw@sisk.pl>2007-02-10 01:43:33 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:19 -0800
commit259130526c267550bc365d3015917d90667732f1 (patch)
treed484ba8cdb5c44ebfe2c31ca3bd1040d52bc30f8 /kernel
parented746e3b18f4df18afa3763155972c5835f284c5 (diff)
downloadlwn-259130526c267550bc365d3015917d90667732f1.tar.gz
lwn-259130526c267550bc365d3015917d90667732f1.zip
[PATCH] swsusp: Change code ordering in user.c
Change the ordering of code in kernel/power/user.c so that device_suspend() is called before disable_nonboot_cpus() and device_resume() is called after enable_nonboot_cpus(). This is needed to make the userland suspend call pm_ops->finish() after enable_nonboot_cpus() and before device_resume(), as indicated by the recent discussion on Linux-PM (cf. http://lists.osdl.org/pipermail/linux-pm/2006-November/004164.html). The changes here only affect the userland interface of swsusp. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Greg KH <greg@kroah.com> Cc: Nigel Cunningham <nigel@suspend2.net> Cc: Patrick Mochel <mochel@digitalimplant.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/user.c92
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: