Bluetooth: Fix issue with uninitialized nsh.type in DTL-1 driver

[pandora-kernel.git] / kernel / workqueue.c

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 32f8e0d..f71fb2a 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,6 +33,7 @@
 #include <linux/kallsyms.h>
 #include <linux/debug_locks.h>
 #include <linux/lockdep.h>
+#include <trace/workqueue.h>
 
 /*
  * The per-CPU workqueue (if single thread, we always use the first
@@ -123,9 +124,13 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
        return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
 }
 
+DEFINE_TRACE(workqueue_insertion);
+
 static void insert_work(struct cpu_workqueue_struct *cwq,
                        struct work_struct *work, struct list_head *head)
 {
+       trace_workqueue_insertion(cwq->thread, work);
+
        set_wq_data(work, cwq);
        /*
         * Ensure that we get the right work->data if we see the
@@ -257,6 +262,8 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL_GPL(queue_delayed_work_on);
 
+DEFINE_TRACE(workqueue_execution);
+
 static void run_workqueue(struct cpu_workqueue_struct *cwq)
 {
        spin_lock_irq(&cwq->lock);
@@ -275,7 +282,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
                 */
                struct lockdep_map lockdep_map = work->lockdep_map;
 #endif
-
+               trace_workqueue_execution(cwq->thread, work);
                cwq->current_work = work;
                list_del_init(cwq->worklist.next);
                spin_unlock_irq(&cwq->lock);
@@ -746,6 +753,8 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
        return cwq;
 }
 
+DEFINE_TRACE(workqueue_creation);
+
 static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 {
        struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
@@ -768,6 +777,8 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
                sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
        cwq->thread = p;
 
+       trace_workqueue_creation(cwq->thread, cpu);
+
        return 0;
 }
 
@@ -849,6 +860,8 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
 }
 EXPORT_SYMBOL_GPL(__create_workqueue_key);
 
+DEFINE_TRACE(workqueue_destruction);
+
 static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
 {
        /*
@@ -872,6 +885,7 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
         * checks list_empty(), and a "normal" queue_work() can't use
         * a dead CPU.
         */
+       trace_workqueue_destruction(cwq->thread);
        kthread_stop(cwq->thread);
        cwq->thread = NULL;
 }
@@ -952,20 +966,20 @@ undo:
 }
 
 #ifdef CONFIG_SMP
-static struct workqueue_struct *work_on_cpu_wq __read_mostly;
 
 struct work_for_cpu {
-       struct work_struct work;
+       struct completion completion;
        long (*fn)(void *);
        void *arg;
        long ret;
 };
 
-static void do_work_for_cpu(struct work_struct *w)
+static int do_work_for_cpu(void *_wfc)
 {
-       struct work_for_cpu *wfc = container_of(w, struct work_for_cpu, work);
-
+       struct work_for_cpu *wfc = _wfc;
        wfc->ret = wfc->fn(wfc->arg);
+       complete(&wfc->completion);
+       return 0;
 }
 
 /**
@@ -976,17 +990,23 @@ static void do_work_for_cpu(struct work_struct *w)
  *
  * This will return the value @fn returns.
  * It is up to the caller to ensure that the cpu doesn't go offline.
+ * The caller must not hold any locks which would prevent @fn from completing.
  */
 long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
 {
-       struct work_for_cpu wfc;
-
-       INIT_WORK(&wfc.work, do_work_for_cpu);
-       wfc.fn = fn;
-       wfc.arg = arg;
-       queue_work_on(cpu, work_on_cpu_wq, &wfc.work);
-       flush_work(&wfc.work);
-
+       struct task_struct *sub_thread;
+       struct work_for_cpu wfc = {
+               .completion = COMPLETION_INITIALIZER_ONSTACK(wfc.completion),
+               .fn = fn,
+               .arg = arg,
+       };
+
+       sub_thread = kthread_create(do_work_for_cpu, &wfc, "work_for_cpu");
+       if (IS_ERR(sub_thread))
+               return PTR_ERR(sub_thread);
+       kthread_bind(sub_thread, cpu);
+       wake_up_process(sub_thread);
+       wait_for_completion(&wfc.completion);
        return wfc.ret;
 }
 EXPORT_SYMBOL_GPL(work_on_cpu);
@@ -1002,8 +1022,4 @@ void __init init_workqueues(void)
        hotcpu_notifier(workqueue_cpu_callback, 0);
        keventd_wq = create_workqueue("events");
        BUG_ON(!keventd_wq);
-#ifdef CONFIG_SMP
-       work_on_cpu_wq = create_workqueue("work_on_cpu");
-       BUG_ON(!work_on_cpu_wq);
-#endif
 }