CAPI: Fix locking around capiminor's output queue and drop workaround_lock

[safe/jmp/linux-2.6] / mm / backing-dev.c

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 1065b71..0e8ca03 100644 (file)
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -604,10 +604,14 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
 
        /*
         * Finally, kill the kernel threads. We don't need to be RCU
-        * safe anymore, since the bdi is gone from visibility.
+        * safe anymore, since the bdi is gone from visibility. Force
+        * unfreeze of the thread before calling kthread_stop(), otherwise
+        * it would never exet if it is currently stuck in the refrigerator.
         */
-       list_for_each_entry(wb, &bdi->wb_list, list)
+       list_for_each_entry(wb, &bdi->wb_list, list) {
+               thaw_process(wb->task);
                kthread_stop(wb->task);
+       }
 }
 
 /*
@@ -628,6 +632,8 @@ static void bdi_prune_sb(struct backing_dev_info *bdi)
 void bdi_unregister(struct backing_dev_info *bdi)
 {
        if (bdi->dev) {
+               bdi_prune_sb(bdi);
+
                if (!bdi_cap_flush_forker(bdi))
                        bdi_wb_shutdown(bdi);
                bdi_debug_unregister(bdi);
@@ -697,7 +703,6 @@ void bdi_destroy(struct backing_dev_info *bdi)
                spin_unlock(&inode_lock);
        }
 
-       bdi_prune_sb(bdi);
        bdi_unregister(bdi);
 
        for (i = 0; i < NR_BDI_STAT_ITEMS; i++)