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

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Message-ID: <CAJZ5v0gSY7sJ2zsUsBeNFpT8XnL5yHd0inxh1+pXa9s1b9M50A@mail.gmail.com>
Date:   Tue, 2 Aug 2022 13:01:21 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Peter Wang <peter.wang@...iatek.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] PM-runtime: Check supplier_preactivated before release supplier

On Tue, Aug 2, 2022 at 5:19 AM Peter Wang <peter.wang@...iatek.com> wrote:
>
>
> > Hi Rafael,
> >
> > Yes, it is very clear!
> > I miss this important key point that usage_count is always >
> > rpm_active 1.
> > I think this patch could work.
> >
> > Thanks.
> > Peter
> >
> >
> >
> >
> Hi Rafael,
>
> After test with commit ("887371066039011144b4a94af97d9328df6869a2 PM:
> runtime: Fix supplier device management during consumer probe") past weeks,
> The supplier still suspend when consumer is active "after"
> pm_runtime_put_suppliers.
> Do you have any idea about that?

Well, this means that the consumer probe doesn't bump up the
supplier's PM-runtime usage counter as appropriate.

You need to tell me more about what happens during the consumer probe.
Which driver is this?