binder: call poll_wait() unconditionally.

Because we're not guaranteed that subsequent calls
to poll() will have a poll_table_struct parameter
with _qproc set. When _qproc is not set, poll_wait()
is a noop, and we won't be woken up correctly.

Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 10 deletions

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 0621a95b8597..fddf76ef5bd6 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3662,12 +3662,6 @@ static void binder_stat_br(struct binder_proc *proc,
         }
 }
 
-static int binder_has_thread_work(struct binder_thread *thread)
-{
-        return !binder_worklist_empty(thread->proc, &thread->todo) ||
-                thread->looper_need_return;
-}
-
 static int binder_put_node_cmd(struct binder_proc *proc,
                                struct binder_thread *thread,
                                void __user **ptrp,
@@ -4297,12 +4291,9 @@ static unsigned int binder_poll(struct file *filp,
 
         binder_inner_proc_unlock(thread->proc);
 
-        if (binder_has_work(thread, wait_for_proc_work))
-                return POLLIN;
-
         poll_wait(filp, &thread->wait, wait);
 
-        if (binder_has_thread_work(thread))
+        if (binder_has_work(thread, wait_for_proc_work))
                 return POLLIN;
 
         return 0;