Re: [PATCH v3 5/6] sched/deadline/rtmutex: Fix unprotected PI access in enqueue_task_dl()

[Xunlei Pang]

On 2016/04/14 at 23:31, Peter Zijlstra wrote:
> On Thu, Apr 14, 2016 at 07:37:06PM +0800, Xunlei Pang wrote:
>> We access @pi_task's data without any lock in enqueue_task_dl(), though
>> checked "dl_prio(pi_task->normal_prio)" condition, that's not enough.
> The proper fix is to ensure that pi_task is guaranteed to be blocked.

Even if pi_task was blocked, its parameters are still allowed to be changed,
so we have to do that. Did I miss something?

Regards,
Xunlei