在Linux内核模块（驱动程序）关键部分等待用户空间输入
[英]Waiting in Linux Kernel Module(Driver) Critical Section for user-space input
问题描述
I'm new to kernel programming and I was making changes in a Linux Driver. 
我是内核编程的新手，并且正在Linux驱动程序中进行更改。 I want to block/wait in a Critical Section for user input(The communication between the Driver and the user-space Application work). 我想在关键部分中阻止/等待用户输入（驱动程序与用户空间应用程序工作之间的通信）。 The Problem is that when I used wait_event_timeout() the System is being crashed and I am getting BUG: scheduling while atomic: swapper . 问题是，当我使用wait_event_timeout（）时，系统崩溃了，并且我得到了BUG: scheduling while atomic: swapper 。 Is anybody have any idea how to solve this problem and can give me some advice where to start? 有谁知道如何解决这个问题，可以给我一些建议从哪里开始？
1 个解决方案
解决方案1
2 已采纳 2018-09-05 13:14:27
As explained in other questions , you are calling wait_event_timeout in a context when you already have some lock acquired (inside a critical section). 如其他问题所述 ，当您已获取一些锁（在关键部分内）时，您正在上下文中调用wait_event_timeout。 In this point your process can potentially deadlock with other processes and the scheduler complains about it. 在这一点上，您的进程可能会与其他进程陷入僵局，并且调度程序会对此抱怨。 Please, review the point where you are calling wait_event_timeout and check if the I/O is performed in the correct place and if you have unlocked all synchronization primitives before sending your process to sleep. 请检查调用wait_event_timeout的位置，并检查I / O是否在正确的位置执行，以及是否已解锁所有同步原语，然后再将进程发送到睡眠状态。
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