linux-kernel - [PATCH v3] of/platform: Unconditionally pause/resume sync state during kernel init

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Message-Id: <20191209193119.147056-1-saravanak@google.com>
Date:   Mon,  9 Dec 2019 11:31:19 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     kernel test robot <lkp@...el.com>, kernel-team@...roid.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] of/platform: Unconditionally pause/resume sync state
 during kernel init

Commit 5e6669387e22 ("of/platform: Pause/resume sync state during init
and of_platform_populate()") paused/resumed sync state during init only
if Linux had parsed and populated a devicetree.

However, the check for that (of_have_populated_dt()) can change after
of_platform_default_populate_init() executes.  One example of this is
when devicetree unittests are enabled.  This causes an unmatched
pause/resume of sync state. To avoid this, just unconditionally
pause/resume sync state during init.

Fixes: 5e6669387e22 ("of/platform: Pause/resume sync state during init and of_platform_populate()")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Saravana Kannan <saravanak@...gle.com>
Reviewed-by: Frank Rowand <frowand.list@...il.com>
---

v1->v2:
- Updated the commit text to address Frank's comments
- Added Frank's R-b
v2->v3:
- Added this change log to address Greg's comments

 drivers/of/platform.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index d93891a05f60..3371e4a06248 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -518,10 +518,11 @@ static int __init of_platform_default_populate_init(void)
 {
 	struct device_node *node;
 
+	device_links_supplier_sync_state_pause();
+
 	if (!of_have_populated_dt())
 		return -ENODEV;
 
-	device_links_supplier_sync_state_pause();
 	/*
 	 * Handle certain compatibles explicitly, since we don't want to create
 	 * platform_devices for every node in /reserved-memory with a
@@ -545,8 +546,7 @@ arch_initcall_sync(of_platform_default_populate_init);
 
 static int __init of_platform_sync_state_init(void)
 {
-	if (of_have_populated_dt())
-		device_links_supplier_sync_state_resume();
+	device_links_supplier_sync_state_resume();
 	return 0;
 }
 late_initcall_sync(of_platform_sync_state_init);
-- 
2.24.0.393.g34dc348eaf-goog