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Commit 00b40d61 authored by Riley Andrews's avatar Riley Andrews Committed by Greg Kroah-Hartman
Browse files

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: default avatarTodd Kjos <tkjos@google.com>
Signed-off-by: default avatarOmprakash Dhyade <odhyade@codeaurora.org>
Cc: stable <stable@vger.kernel.org> # 4.4+
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c4ea41ba

drivers/android/binder.c

+6 −2
Original line number Diff line number Diff line
@@ -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)

	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: