linux-kernel - [PATCH v2 0/2] PM: runtime: Update device status before letting suppliers suspend (another take)

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Message-ID: <4641414.31r3eYUQgx@kreacher>
Date:   Fri, 19 Mar 2021 15:42:58 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>,
        "elaine.zhang" <zhangqing@...k-chips.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v2 0/2] PM: runtime: Update device status before letting suppliers suspend (another take)

On Thursday, March 18, 2021 7:06:54 PM CET Rafael J. Wysocki wrote:
> Hi All,
> 
> The previous attempt to address the issue tackled by this series, commit
> 44cc89f76464 ("PM: runtime: Update device status before letting suppliers
> suspend") was incorrect, because it introduced a rather nasty race condition
> into __rpm_callback(), so let's revert it (patch [1/2]).
> 
> Instead, let's avoid suspending the suppliers immediately after dropping the
> PM-runtime references to them and do that later, when the status of the
> consumer has changed to RPM_SUSPENDED.
> 
> Please see the patch changelogs for details.
> 
> Elaine, please test this series on the system where you saw the original
> problem.

The above still applies.

The v2 is sent because of some updates in the second patch, plus the tags from Ulf.

Thanks!