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From: Dennis-YC Hsieh <dennis-yc.hsieh@mediatek.com>
To: CK Hu <ck.hu@mediatek.com>
Cc: devicetree@vger.kernel.org, wsd_upstream@mediatek.com,
	Jassi Brar <jassisinghbrar@gmail.com>,
	linux-kernel@vger.kernel.org,
	Houlong Wei <houlong.wei@mediatek.com>,
	Rob Herring <robh+dt@kernel.org>,
	linux-mediatek@lists.infradead.org,
	Bibby Hsieh <bibby.hsieh@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 04/14] mailbox: mediatek: cmdq: clear task in channel before shutdown
Date: Thu, 12 Dec 2019 09:13:41 +0800
Message-ID: <1576113221.17653.6.camel@mtkswgap22> (raw)
In-Reply-To: <1575946181.16676.4.camel@mtksdaap41>

Hi CK,

On Tue, 2019-12-10 at 10:49 +0800, CK Hu wrote:
> 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
> 

Call resume here will cause violation. The thread->task_busy_list empty
means no task work in gce and thread state should already disable
without clock, which is what we want since client try to shut down this
mbox channel. So I think we don't need resume here.


Regards,
Dennis

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

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Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27  1:58 [PATCH v2] support gce on mt6779 platform Dennis YC Hsieh
2019-11-27  1:58 ` [PATCH v2 00/14] " Dennis YC Hsieh
2019-11-27  1:58 ` [PATCH v2 01/14] dt-binding: gce: add gce header file for mt6779 Dennis YC Hsieh
2019-12-05 20:37   ` Rob Herring
2019-11-27  1:58 ` [PATCH v2 02/14] mailbox: cmdq: variablize address shift in platform Dennis YC Hsieh
2019-12-10  1:55   ` CK Hu
2019-12-12  1:03     ` Dennis-YC Hsieh
2019-11-27  1:58 ` [PATCH v2 03/14] mailbox: cmdq: support mt6779 gce platform definition Dennis YC Hsieh
2019-12-10  2:04   ` CK Hu
2019-11-27  1:58 ` [PATCH v2 04/14] mailbox: mediatek: cmdq: clear task in channel before shutdown Dennis YC Hsieh
2019-12-10  2:49   ` CK Hu
2019-12-12  1:13     ` Dennis-YC Hsieh [this message]
2019-12-12  1:31       ` CK Hu
2019-12-12  1:51         ` Dennis-YC Hsieh
2019-12-12  2:03           ` CK Hu
2019-12-12  2:20             ` Dennis-YC Hsieh
2019-11-27  1:58 ` [PATCH v2 05/14] arm64: dts: add gce node for mt6779 Dennis YC Hsieh
2019-12-06  4:05   ` Bibby Hsieh
2019-11-27  1:58 ` [PATCH v2 06/14] soc: mediatek: cmdq: return send msg error code Dennis YC Hsieh
2019-12-06  4:02   ` Bibby Hsieh
2019-12-18  8:00     ` Dennis-YC Hsieh
2019-12-18  8:14       ` Bibby Hsieh
2019-11-27  1:58 ` [PATCH v2 07/14] soc: mediatek: cmdq: add assign function Dennis YC Hsieh
2019-12-10  3:24   ` CK Hu
2019-12-12  1:15     ` Dennis-YC Hsieh
2019-11-27  1:58 ` [PATCH v2 08/14] soc: mediatek: cmdq: add write_s function Dennis YC Hsieh
2019-12-10  5:18   ` CK Hu
2019-12-12  1:31     ` Dennis-YC Hsieh
2019-12-10  7:35   ` Bibby Hsieh
2019-12-12  1:31     ` Dennis-YC Hsieh
2019-11-27  1:58 ` [PATCH v2 09/14] soc: mediatek: cmdq: add read_s function Dennis YC Hsieh
2019-12-10  7:55   ` CK Hu
2019-12-12  1:33     ` Dennis-YC Hsieh
2019-11-27  1:58 ` [PATCH v2 10/14] soc: mediatek: cmdq: add write_s value function Dennis YC Hsieh
2019-11-27  1:58 ` [PATCH v2 11/14] soc: mediatek: cmdq: export finalize function Dennis YC Hsieh
2019-12-10  7:50   ` CK Hu
2019-11-27  1:58 ` [PATCH v2 12/14] soc: mediatek: cmdq: add loop function Dennis YC Hsieh
2019-12-11  1:48   ` CK Hu
2019-12-12  1:37     ` Dennis-YC Hsieh
2019-11-27  1:58 ` [PATCH v2 13/14] soc: mediatek: cmdq: add wait no clear event function Dennis YC Hsieh
2019-12-11  2:04   ` CK Hu
2019-12-12  1:42     ` Dennis-YC Hsieh
2019-11-27  1:58 ` [PATCH v2 14/14] soc: mediatek: cmdq: add set " Dennis YC Hsieh

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