Staging: android: binder: Create dedicated workqueue for binder deferred work

Some drivers flush the global workqueue when closed. This would deadlock if
the last reference to the file was released from the binder.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 669e2a6d611b792f75459829d9352d9a7274ec98..6d6fe7bdebd3a6eee748330d517fa502887e4a60 100644 (file)
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -48,6 +48,7 @@ static struct dentry *binder_debugfs_dir_entry_proc;
 static struct binder_node *binder_context_mgr_node;
 static uid_t binder_context_mgr_uid = -1;
 static int binder_last_id;
+static struct workqueue_struct *binder_deferred_workqueue;
 
 #define BINDER_DEBUG_ENTRY(name) \
 static int binder_##name##_open(struct inode *inode, struct file *file) \
@@ -3109,7 +3110,7 @@ binder_defer_work(struct binder_proc *proc, enum binder_deferred_state defer)
        if (hlist_unhashed(&proc->deferred_work_node)) {
                hlist_add_head(&proc->deferred_work_node,
                                &binder_deferred_list);
-               schedule_work(&binder_deferred_work);
+               queue_work(binder_deferred_workqueue, &binder_deferred_work);
        }
        mutex_unlock(&binder_deferred_lock);
 }
@@ -3552,6 +3553,10 @@ static int __init binder_init(void)
 {
        int ret;
 
+       binder_deferred_workqueue = create_singlethread_workqueue("binder");
+       if (!binder_deferred_workqueue)
+               return -ENOMEM;
+
        binder_debugfs_dir_entry_root = debugfs_create_dir("binder", NULL);
        if (binder_debugfs_dir_entry_root)
                binder_debugfs_dir_entry_proc = debugfs_create_dir("proc",