[PATCH 11/13] ANDROID: binder: don't enqueue death notifications to thread todo.

Martijn Coenen
2017-08-25T09:35:16Z

This allows userspace to request death notifications without
having to worry about getting an immediate callback on the same
thread; one scenario where this would be problematic is if the
death recipient handler grabs a lock that was already taken
earlier (eg as part of a nested transaction).

Signed-off-by: Martijn Coenen <maco@android.com>
---
drivers/android/binder.c | 22 ++++++----------------
1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index e8a70a7c789c..12ab16bb676c 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3668,22 +3668,12 @@ static int binder_thread_write(struct binder_proc *proc,
ref->death = death;
if (ref->node->proc == NULL) {
ref->death->work.type = BINDER_WORK_DEAD_BINDER;
- if (thread->looper &
- (BINDER_LOOPER_STATE_REGISTERED |
- BINDER_LOOPER_STATE_ENTERED))
- binder_enqueue_work(
- proc,
- &ref->death->work,
- &thread->todo);
- else {
- binder_inner_proc_lock(proc);
- binder_enqueue_work_ilocked(
- &ref->death->work,
- &proc->todo);
- binder_wakeup_proc_ilocked(
- proc);
- binder_inner_proc_unlock(proc);
- }
+
+ binder_inner_proc_lock(proc);
+ binder_enqueue_work_ilocked(
+ &ref->death->work, &proc->todo);
+ binder_wakeup_proc_ilocked(proc);
+ binder_inner_proc_unlock(proc);
}
} else {
if (ref->death == NULL) {
--
2.14.1.480.gb18f417b89-goog