linux-kernel - [PATCH v1 0/2] PM: runtime: Update device status before letting suppliers suspend (another take)

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Message-ID: <5448054.DvuYhMxLoT@kreacher>
Date:   Thu, 18 Mar 2021 19:06:54 +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 v1 0/2] PM: runtime: Update device status before letting suppliers suspend (another take)

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.

Thanks!