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