linux-kernel - [PATCH] PM / runtime: Check ignore_children in pm_runtime_need_not

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Message-ID: <3700531.tJUn8czj9X@aspire.rjw.lan>
Date:   Mon, 15 Jan 2018 01:46:25 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] PM / runtime: Check ignore_children in pm_runtime_need_not_resume()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Modify pm_runtime_need_not_resume() to make it avoid taking
power.child_count for devices with power.ignore_children which
is consistent with the runtime PM usage of these fields.

Suggested-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/base/power/runtime.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-pm/drivers/base/power/runtime.c
===================================================================
--- linux-pm.orig/drivers/base/power/runtime.c
+++ linux-pm/drivers/base/power/runtime.c
@@ -1616,7 +1616,8 @@ void pm_runtime_drop_link(struct device
 static bool pm_runtime_need_not_resume(struct device *dev)
 {
 	return atomic_read(&dev->power.usage_count) <= 1 &&
-		atomic_read(&dev->power.child_count) == 0;
+		(atomic_read(&dev->power.child_count) == 0 ||
+		 dev->power.ignore_children);
 }
 
 /**