drm/i915: Save the old CDCLK atomic state

[mirror_ubuntu-bionic-kernel.git] / kernel / workqueue.c

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index f699122dab321793bffa596da732d793d23d379b..b94f4fcfcd9afd44a4df1491ab60f6c759ba9f5f 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1604,6 +1604,40 @@ bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL_GPL(mod_delayed_work_on);
 
+static void rcu_work_rcufn(struct rcu_head *rcu)
+{
+       struct rcu_work *rwork = container_of(rcu, struct rcu_work, rcu);
+
+       /* read the comment in __queue_work() */
+       local_irq_disable();
+       __queue_work(WORK_CPU_UNBOUND, rwork->wq, &rwork->work);
+       local_irq_enable();
+}
+
+/**
+ * queue_rcu_work - queue work after a RCU grace period
+ * @wq: workqueue to use
+ * @rwork: work to queue
+ *
+ * Return: %false if @rwork was already pending, %true otherwise.  Note
+ * that a full RCU grace period is guaranteed only after a %true return.
+ * While @rwork is guarnateed to be executed after a %false return, the
+ * execution may happen before a full RCU grace period has passed.
+ */
+bool queue_rcu_work(struct workqueue_struct *wq, struct rcu_work *rwork)
+{
+       struct work_struct *work = &rwork->work;
+
+       if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
+               rwork->wq = wq;
+               call_rcu(&rwork->rcu, rcu_work_rcufn);
+               return true;
+       }
+
+       return false;
+}
+EXPORT_SYMBOL(queue_rcu_work);
+
 /**
  * worker_enter_idle - enter idle state
  * @worker: worker which is entering idle state
@@ -3001,6 +3035,26 @@ bool flush_delayed_work(struct delayed_work *dwork)
 }
 EXPORT_SYMBOL(flush_delayed_work);
 
+/**
+ * flush_rcu_work - wait for a rwork to finish executing the last queueing
+ * @rwork: the rcu work to flush
+ *
+ * Return:
+ * %true if flush_rcu_work() waited for the work to finish execution,
+ * %false if it was already idle.
+ */
+bool flush_rcu_work(struct rcu_work *rwork)
+{
+       if (test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&rwork->work))) {
+               rcu_barrier();
+               flush_work(&rwork->work);
+               return true;
+       } else {
+               return flush_work(&rwork->work);
+       }
+}
+EXPORT_SYMBOL(flush_rcu_work);
+
 static bool __cancel_work(struct work_struct *work, bool is_dwork)
 {
        unsigned long flags;
@@ -4168,6 +4222,22 @@ void workqueue_set_max_active(struct workqueue_struct *wq, int max_active)
 }
 EXPORT_SYMBOL_GPL(workqueue_set_max_active);
 
+/**
+ * current_work - retrieve %current task's work struct
+ *
+ * Determine if %current task is a workqueue worker and what it's working on.
+ * Useful to find out the context that the %current task is running in.
+ *
+ * Return: work struct if %current task is a workqueue worker, %NULL otherwise.
+ */
+struct work_struct *current_work(void)
+{
+       struct worker *worker = current_wq_worker();
+
+       return worker ? worker->current_work : NULL;
+}
+EXPORT_SYMBOL(current_work);
+
 /**
  * current_is_workqueue_rescuer - is %current workqueue rescuer?
  *
@@ -5310,7 +5380,7 @@ int workqueue_sysfs_register(struct workqueue_struct *wq)
 
        ret = device_register(&wq_dev->dev);
        if (ret) {
-               kfree(wq_dev);
+               put_device(&wq_dev->dev);
                wq->wq_dev = NULL;
                return ret;
        }