linux-kernel - Re: [PATCH v1] PM-runtime: Check supplier

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Date:   Tue, 28 Jun 2022 17:54:41 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Peter Wang <peter.wang@...iatek.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Avri Altman <avri.altman@....com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>, chun-hung.wu@...iatek.com,
        alice.chao@...iatek.com, cc.chou@...iatek.com,
        chaotian.jing@...iatek.com, jiajie.hao@...iatek.com,
        powen.kao@...iatek.com, qilin.tan@...iatek.com,
        lin.gui@...iatek.com, tun-yu.yu@...iatek.com
Subject: Re: [PATCH v1] PM-runtime: Check supplier_preactivated before release supplier

On Tue, Jun 28, 2022 at 3:53 AM Peter Wang <peter.wang@...iatek.com> wrote:
>
>
> On 6/28/22 3:00 AM, Rafael J. Wysocki wrote:
> > On Mon, Jun 13, 2022 at 2:08 PM <peter.wang@...iatek.com> wrote:
> >> From: Peter Wang <peter.wang@...iatek.com>
> >>
> >> With divice link of DL_FLAG_PM_RUNTIME, if consumer call pm_runtime_get_suppliers
> >> to prevent supplier enter suspend, pm_runtime_release_supplier should
> >> check supplier_preactivated before let supplier enter suspend.
> > Why?
>
> because supplier_preactivated is true means supplier cannot enter
> suspend, right?

No, it doesn't mean that.