[power] Fix up refrigerator to work with ^Z-ed processes

Originally from Pavel Machek:

schedule() added makes processes start at exactly that point, making
printouts nicer.

diff --git a/kernel/power/process.c b/kernel/power/process.c
index bd80a35f5e6abb396e4145c206514dd6b4ceda78..671730612e0fb912bedff87489f9877aba41cd52 100644 (file)
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -23,14 +23,16 @@
  */
 #define TIMEOUT        (6 * HZ)
 
-#define INTERESTING(p) \
-                       /* We don't want to touch kernel_threads..*/ \
-                       if (p->flags & PF_IOTHREAD) \
-                               continue; \
-                       if (p == current) \
-                               continue; \
-                       if (p->state == TASK_ZOMBIE) \
-                               continue;
+
+static inline int freezeable(struct task_struct * p)
+{
+       if ((p == current) || 
+           (p->flags & PF_IOTHREAD) || 
+           (p->state == TASK_ZOMBIE) ||
+           (p->state == TASK_DEAD))
+               return 0;
+       return 1;
+}
 
 /* Refrigerator is place where frozen processes are stored :-). */
 void refrigerator(unsigned long flag)
@@ -71,8 +73,10 @@ int freeze_processes(void)
                read_lock(&tasklist_lock);
                do_each_thread(g, p) {
                        unsigned long flags;
-                       INTERESTING(p);
-                       if (p->flags & PF_FROZEN)
+                       if (!freezeable(p))
+                               continue;
+                       if ((p->flags & PF_FROZEN) ||
+                           (p->state == TASK_STOPPED))
                                continue;
 
                        /* FIXME: smp problem here: we may not access other process' flags
@@ -104,15 +108,18 @@ void thaw_processes(void)
        printk( "Restarting tasks..." );
        read_lock(&tasklist_lock);
        do_each_thread(g, p) {
-               INTERESTING(p);
-               
-               if (p->flags & PF_FROZEN) p->flags &= ~PF_FROZEN;
-               else
+               if (!freezeable(p))
+                       continue;
+               if (p->flags & PF_FROZEN) {
+                       p->flags &= ~PF_FROZEN;
+                       wake_up_process(p);
+               } else
                        printk(KERN_INFO " Strange, %s not stopped\n", p->comm );
                wake_up_process(p);
        } while_each_thread(g, p);
 
        read_unlock(&tasklist_lock);
+       schedule();
        printk( " done\n" );
        MDELAY(500);
 }