diff options
| author | Riley Andrews <riandrews@google.com> | 2017-06-29 12:01:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-17 14:44:19 +0200 |
| commit | 00b40d613352c623aaae88a44e5ded7c912909d7 (patch) | |
| tree | eba0887b952a02669f503511be81d05b829d8e9a | |
| parent | c4ea41ba195d01c9af66fb28711a16cc97caa9c5 (diff) | |
binder: Use wake up hint for synchronous transactions.
Use wake_up_interruptible_sync() to hint to the scheduler binder
transactions are synchronous wakeups. Disable preemption while waking
to avoid ping-ponging on the binder lock.
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Omprakash Dhyade <odhyade@codeaurora.org>
Cc: stable <stable@vger.kernel.org> # 4.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/android/binder.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 9393924ae8e8..f7665c31feca 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2200,8 +2200,12 @@ static void binder_transaction(struct binder_proc *proc, list_add_tail(&t->work.entry, target_list); tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE; list_add_tail(&tcomplete->entry, &thread->todo); - if (target_wait) - wake_up_interruptible(target_wait); + if (target_wait) { + if (reply || !(t->flags & TF_ONE_WAY)) + wake_up_interruptible_sync(target_wait); + else + wake_up_interruptible(target_wait); + } return; err_translate_failed: |