Freezer: return int from freeze_processes

Make try_to_freeze_tasks() and freeze_processes() return -EBUSY on failure
instead of the number of unfrozen tasks (none of the callers actually uses
this number).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/power/process.c b/kernel/power/process.c
index 9b5301c..00cdbe5 100644 (file)
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -105,7 +105,7 @@ static void cancel_freezing(struct task_struct *p)
        }
 }
 
-static unsigned int try_to_freeze_tasks(int freeze_user_space)
+static int try_to_freeze_tasks(int freeze_user_space)
 {
        struct task_struct *g, *p;
        unsigned long end_time;
@@ -176,28 +176,25 @@ static unsigned int try_to_freeze_tasks(int freeze_user_space)
                read_unlock(&tasklist_lock);
        }
 
-       return todo;
+       return todo ? -EBUSY : 0;
 }
 
 /**
  *     freeze_processes - tell processes to enter the refrigerator
- *
- *     Returns 0 on success, or the number of processes that didn't freeze,
- *     although they were told to.
  */
 int freeze_processes(void)
 {
-       unsigned int nr_unfrozen;
+       int error;
 
        printk("Stopping tasks ... ");
-       nr_unfrozen = try_to_freeze_tasks(FREEZER_USER_SPACE);
-       if (nr_unfrozen)
-               return nr_unfrozen;
+       error = try_to_freeze_tasks(FREEZER_USER_SPACE);
+       if (error)
+               return error;
 
        sys_sync();
-       nr_unfrozen = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
-       if (nr_unfrozen)
-               return nr_unfrozen;
+       error = try_to_freeze_tasks(FREEZER_KERNEL_THREADS);
+       if (error)
+               return error;
 
        printk("done.\n");
        BUG_ON(in_atomic());