linux-kernel - [PATCH 5.12 041/127] misc: eeprom: at24: check suspend status before disable regulator

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Message-Id: <20210524152336.237370210@linuxfoundation.org>
Date:   Mon, 24 May 2021 17:25:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: [PATCH 5.12 041/127] misc: eeprom: at24: check suspend status before disable regulator

From: Hsin-Yi Wang <hsinyi@...omium.org>

commit 2962484dfef8dbb7f9059822bc26ce8a04d0e47c upstream.

cd5676db0574 ("misc: eeprom: at24: support pm_runtime control") disables
regulator in runtime suspend. If runtime suspend is called before
regulator disable, it will results in regulator unbalanced disabling.

Fixes: cd5676db0574 ("misc: eeprom: at24: support pm_runtime control")
Cc: stable <stable@...r.kernel.org>
Acked-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
Link: https://lore.kernel.org/r/20210420133050.377209-1-hsinyi@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/eeprom/at24.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -763,7 +763,8 @@ static int at24_probe(struct i2c_client
 	at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
 	if (IS_ERR(at24->nvmem)) {
 		pm_runtime_disable(dev);
-		regulator_disable(at24->vcc_reg);
+		if (!pm_runtime_status_suspended(dev))
+			regulator_disable(at24->vcc_reg);
 		return PTR_ERR(at24->nvmem);
 	}
 
@@ -774,7 +775,8 @@ static int at24_probe(struct i2c_client
 	err = at24_read(at24, 0, &test_byte, 1);
 	if (err) {
 		pm_runtime_disable(dev);
-		regulator_disable(at24->vcc_reg);
+		if (!pm_runtime_status_suspended(dev))
+			regulator_disable(at24->vcc_reg);
 		return -ENODEV;
 	}