linux-kernel - Re: [PATCH v2 04/14] mailbox: mediatek: cmdq: clear task in channel before shutdown

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Date:   Tue, 10 Dec 2019 10:49:41 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 04/14] mailbox: mediatek: cmdq: clear task in channel
 before shutdown

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@...iatek.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 = {