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SubjectRe: [PATCH v2 04/14] mailbox: mediatek: cmdq: clear task in channel before shutdown
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Hi, Dennis:

On Wed, 2019-11-27 at 09:58 +0800, Dennis YC Hsieh wrote:
> Do success callback in channel when shutdown. For those task not finish,
> callback with error code thus client has chance to cleanup or reset.
>
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> ---
> drivers/mailbox/mtk-cmdq-mailbox.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
> index fd519b6f518b..c12a768d1175 100644
> --- a/drivers/mailbox/mtk-cmdq-mailbox.c
> +++ b/drivers/mailbox/mtk-cmdq-mailbox.c
> @@ -450,6 +450,32 @@ static int cmdq_mbox_startup(struct mbox_chan *chan)
>
> static void cmdq_mbox_shutdown(struct mbox_chan *chan)
> {
> + struct cmdq_thread *thread = (struct cmdq_thread *)chan->con_priv;
> + struct cmdq *cmdq = dev_get_drvdata(chan->mbox->dev);
> + struct cmdq_task *task, *tmp;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&thread->chan->lock, flags);
> + if (list_empty(&thread->task_busy_list))
> + goto done;
> +
> + WARN_ON(cmdq_thread_suspend(cmdq, thread) < 0);
> +
> + /* make sure executed tasks have success callback */
> + cmdq_thread_irq_handler(cmdq, thread);
> + if (list_empty(&thread->task_busy_list))
> + goto done;
> +
> + list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
> + list_entry) {
> + cmdq_task_exec_done(task, -ECONNABORTED);
> + kfree(task);
> + }
> +
> + cmdq_thread_disable(cmdq, thread);
> + clk_disable(cmdq->clock);
> +done:

cmdq_thread_resume(thread);

Regards,
CK

> + spin_unlock_irqrestore(&thread->chan->lock, flags);
> }
>
> static const struct mbox_chan_ops cmdq_mbox_chan_ops = {

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