Function to Cancel and Cleanup Jobs in GPU Context

err = mtgpu_fw_cancel_cmd_submit(vm_ctx, MTFW_SUBMISSION_CMD_CANCEL);
os_create_waitqueue_head(&vm_ctx->job_item_wait_queue);
err = os_wait_event_timeout(vm_ctx->job_item_wait_queue,
		      	    list_empty(&vm_ctx->job_item_list),
		            os_msecs_to_jiffies(WAIT_TIMEOUT_MS));
if (!err) {
	/* 
	 * May need to retry, because the skip cmd is also added to the cleanup, 
	 * which may cause a stuck situation 
	 * */
	os_dev_err(dev, "%s:wait job_item_list for NULL timeout after cancel cmd, err = %d.",__func__, err);
	return PVRSRV_ERROR_TIMEOUT;
}

os_destroy_waitqueue_head(vm_ctx->job_item_wait_queue);
vm_ctx->job_item_wait_queue = NULL;

err = mtgpu_fw_cancel_cmd_submit(vm_ctx, MTFW_SUBMISSION_CMD_TERMINATED);

如果要将上面这段代码封装到一个函数里面，那这个函数的名字取什么比较合适？

根据这段代码的功能，它主要是执行取消命令、等待队列清空、处理超时错误并最终提交终止命令。一个合适的函数名应该能够反映这些操作的主要意图。以下是几个可能的函数名：

1. mtgpu_handle_cmd_cancel_and_terminate
2. mtgpu_cancel_and_cleanup_jobs
3. mtgpu_cancel_cmd_and_wait
4. mtgpu_terminate_after_cancel
5. mtgpu_cancel_and_terminate_jobs

其中，mtgpu_cancel_and_cleanup_jobs 可能是一个比较合适的名字，因为它清晰地表达了函数的主要操作：取消命令并清理任务。

以下是如何将这段代码封装到一个函数中的示例：

#define WAIT_TIMEOUT_MS 1000 // 假设的超时时间

int mtgpu_cancel_and_cleanup_jobs(struct vm_context *vm_ctx, struct device *dev) {
    int err;

    err = mtgpu_fw_cancel_cmd_submit(vm_ctx, MTFW_SUBMISSION_CMD_CANCEL);
    if (err) {
        os_dev_err(dev, "%s: Failed to submit cancel command, err = %d.", __func__, err);
        return err;
    }

    os_create_waitqueue_head(&vm_ctx->job_item_wait_queue);
    err = os_wait_event_timeout(vm_ctx->job_item_wait_queue,
                                list_empty(&vm_ctx->job_item_list),
                                os_msecs_to_jiffies(WAIT_TIMEOUT_MS));
    if (!err) {
        /* 
         * May need to retry, because the skip cmd is also added to the cleanup, 
         * which may cause a stuck situation 
         */
        os_dev_err(dev, "%s: wait job_item_list for NULL timeout after cancel cmd, err = %d.", __func__, err);
        os_destroy_waitqueue_head(vm_ctx->job_item_wait_queue);
        vm_ctx->job_item_wait_queue = NULL;
        return PVRSRV_ERROR_TIMEOUT;
    }

    os_destroy_waitqueue_head(vm_ctx->job_item_wait_queue);
    vm_ctx->job_item_wait_queue = NULL;

    err = mtgpu_fw_cancel_cmd_submit(vm_ctx, MTFW_SUBMISSION_CMD_TERMINATED);
    if (err) {
        os_dev_err(dev, "%s: Failed to submit terminate command, err = %d.", __func__, err);
        return err;
    }

    return 0;
}

这个函数名 mtgpu_cancel_and_cleanup_jobs 反映了函数的主要操作：取消命令并清理任务。你可以根据具体的需求和代码风格进行调整。