Merge remote-tracking branch 'lsk/v3.10/topic/mm-timer' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / mm / backing-dev.c

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 95e437435788cdd6d4755bb41265c8880b0717c2..eea1a9dfac38fc84a56a72f8161ae1fe7ddb8260 100644 (file)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -296,7 +296,10 @@ void bdi_wakeup_thread_delayed(struct backing_dev_info *bdi)
        unsigned long timeout;
 
        timeout = msecs_to_jiffies(dirty_writeback_interval * 10);
-       queue_delayed_work(bdi_wq, &bdi->wb.dwork, timeout);
+       spin_lock_bh(&bdi->wb_lock);
+       if (test_bit(BDI_registered, &bdi->state))
+               queue_delayed_work(bdi_wq, &bdi->wb.dwork, timeout);
+       spin_unlock_bh(&bdi->wb_lock);
 }
 
 /*
@@ -309,9 +312,6 @@ static void bdi_remove_from_list(struct backing_dev_info *bdi)
        spin_unlock_bh(&bdi_lock);
 
        synchronize_rcu_expedited();
-
-       /* bdi_list is now unused, clear it to mark @bdi dying */
-       INIT_LIST_HEAD(&bdi->bdi_list);
 }
 
 int bdi_register(struct backing_dev_info *bdi, struct device *parent,
@@ -362,6 +362,11 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
         */
        bdi_remove_from_list(bdi);
 
+       /* Make sure nobody queues further work */
+       spin_lock_bh(&bdi->wb_lock);
+       clear_bit(BDI_registered, &bdi->state);
+       spin_unlock_bh(&bdi->wb_lock);
+
        /*
         * Drain work list and shutdown the delayed_work.  At this point,
         * @bdi->bdi_list is empty telling bdi_Writeback_workfn() that @bdi