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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>
This commit is contained in:
Martijn Coenen 2017-10-09 14:26:56 +02:00 committed by Greg Kroah-Hartman
parent 33d930e59a
commit 66b83a4cdd
1 changed files with 1 additions and 10 deletions
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11
drivers/android/binder.c
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@ -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;