linux-kernel - [PATCH 5.4 028/178] Revert "i2c: tegra: Fix suspending in active runtime PM state"

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Message-Id: <20200629152523.2494198-29-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:22:53 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thierry Reding <treding@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 028/178] Revert "i2c: tegra: Fix suspending in active runtime PM state"

From: Thierry Reding <treding@...dia.com>

[ Upstream commit 78ad73421831247e46c31899a7bead02740e4bef ]

This reverts commit 9f42de8d4ec2304f10bbc51dc0484f3503d61196.

It's not safe to use pm_runtime_force_{suspend,resume}(), especially
during the noirq phase of suspend. See also the guidance provided in
commit 1e2ef05bb8cf ("PM: Limit race conditions between runtime PM
and system sleep (v2)").

Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-tegra.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index dbc43cfec19d4..331f7cca9babe 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1719,14 +1719,9 @@ static int tegra_i2c_remove(struct platform_device *pdev)
 static int __maybe_unused tegra_i2c_suspend(struct device *dev)
 {
 	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
-	int err;
 
 	i2c_mark_adapter_suspended(&i2c_dev->adapter);
 
-	err = pm_runtime_force_suspend(dev);
-	if (err < 0)
-		return err;
-
 	return 0;
 }
 
@@ -1747,10 +1742,6 @@ static int __maybe_unused tegra_i2c_resume(struct device *dev)
 	if (err)
 		return err;
 
-	err = pm_runtime_force_resume(dev);
-	if (err < 0)
-		return err;
-
 	i2c_mark_adapter_resumed(&i2c_dev->adapter);
 
 	return 0;
-- 
2.25.1