linux-kernel - [PATCH 4.14 13/36] Revert "regulator: Defer init completion for a while after late

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Date:   Thu, 19 Dec 2019 19:34:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Siddharth Kapoor <ksiddharth@...gle.com>,
        Mark Brown <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 4.14 13/36] Revert "regulator: Defer init completion for a while after late_initcall"

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This reverts commit d7ce17fba6c8e316ca9a554a87edddce6f862435 which is
commit 55576cf1853798e86f620766e23b604c9224c19c upstream.

It's causing "odd" interactions with older kernels, so it probably isn't
a good idea to cause timing changes there.  This has been reported to
cause oopses on Pixel devices.

Reported-by: Siddharth Kapoor <ksiddharth@...gle.com>
Cc: Mark Brown <broonie@...nel.org>
Cc: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/regulator/core.c |   42 +++++++++++-------------------------------
 1 file changed, 11 insertions(+), 31 deletions(-)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4503,7 +4503,7 @@ static int __init regulator_init(void)
 /* init early to allow our consumers to complete system booting */
 core_initcall(regulator_init);
 
-static int regulator_late_cleanup(struct device *dev, void *data)
+static int __init regulator_late_cleanup(struct device *dev, void *data)
 {
 	struct regulator_dev *rdev = dev_to_rdev(dev);
 	const struct regulator_ops *ops = rdev->desc->ops;
@@ -4552,9 +4552,18 @@ unlock:
 	return 0;
 }
 
-static void regulator_init_complete_work_function(struct work_struct *work)
+static int __init regulator_init_complete(void)
 {
 	/*
+	 * Since DT doesn't provide an idiomatic mechanism for
+	 * enabling full constraints and since it's much more natural
+	 * with DT to provide them just assume that a DT enabled
+	 * system has full constraints.
+	 */
+	if (of_have_populated_dt())
+		has_full_constraints = true;
+
+	/*
 	 * Regulators may had failed to resolve their input supplies
 	 * when were registered, either because the input supply was
 	 * not registered yet or because its parent device was not
@@ -4571,35 +4580,6 @@ static void regulator_init_complete_work
 	 */
 	class_for_each_device(&regulator_class, NULL, NULL,
 			      regulator_late_cleanup);
-}
-
-static DECLARE_DELAYED_WORK(regulator_init_complete_work,
-			    regulator_init_complete_work_function);
-
-static int __init regulator_init_complete(void)
-{
-	/*
-	 * Since DT doesn't provide an idiomatic mechanism for
-	 * enabling full constraints and since it's much more natural
-	 * with DT to provide them just assume that a DT enabled
-	 * system has full constraints.
-	 */
-	if (of_have_populated_dt())
-		has_full_constraints = true;
-
-	/*
-	 * We punt completion for an arbitrary amount of time since
-	 * systems like distros will load many drivers from userspace
-	 * so consumers might not always be ready yet, this is
-	 * particularly an issue with laptops where this might bounce
-	 * the display off then on.  Ideally we'd get a notification
-	 * from userspace when this happens but we don't so just wait
-	 * a bit and hope we waited long enough.  It'd be better if
-	 * we'd only do this on systems that need it, and a kernel
-	 * command line option might be useful.
-	 */
-	schedule_delayed_work(&regulator_init_complete_work,
-			      msecs_to_jiffies(30000));
 
 	return 0;
 }