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.

Change-Id: Ifdabc0b383fecb20836d1bbb9786c632402a14e1
Signed-off-by: Arve Hjønnevåg <arve@android.com>

diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 3b46412..6e1d78c 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",