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authorRafael J. Wysocki <rjw@sisk.pl>2007-07-19 01:47:34 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:42 -0700
commite7cd8a722745a01bcfac4d4a52d53391d177da20 (patch)
tree45c7e57cac39a6aa90d1c5f6682ddd12bdc8315a /kernel/power
parentf4a3a7d60c9c9a961e4c970f6eb41dd1c9d3ec21 (diff)
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>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/process.c21
1 files changed, 9 insertions, 12 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 9b5301c73b8..00cdbe5f518 100644
--- 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());