tty_port: handle the nonblocking open of a dead port corner case

[safe/jmp/linux-2.6] / kernel / workqueue.c

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 47cdd7e..67e526b 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -685,6 +685,7 @@ EXPORT_SYMBOL(schedule_delayed_work_on);
 int schedule_on_each_cpu(work_func_t func)
 {
        int cpu;
+       int orig = -1;
        struct work_struct *works;
 
        works = alloc_percpu(struct work_struct);
@@ -692,14 +693,28 @@ int schedule_on_each_cpu(work_func_t func)
                return -ENOMEM;
 
        get_online_cpus();
+
+       /*
+        * When running in keventd don't schedule a work item on
+        * itself.  Can just call directly because the work queue is
+        * already bound.  This also is faster.
+        */
+       if (current_is_keventd())
+               orig = raw_smp_processor_id();
+
        for_each_online_cpu(cpu) {
                struct work_struct *work = per_cpu_ptr(works, cpu);
 
                INIT_WORK(work, func);
-               schedule_work_on(cpu, work);
+               if (cpu != orig)
+                       schedule_work_on(cpu, work);
        }
+       if (orig >= 0)
+               func(per_cpu_ptr(works, orig));
+
        for_each_online_cpu(cpu)
                flush_work(per_cpu_ptr(works, cpu));
+
        put_online_cpus();
        free_percpu(works);
        return 0;