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

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Message-Id: <20210420133050.377209-1-hsinyi@chromium.org>
Date:   Tue, 20 Apr 2021 21:30:50 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] misc: eeprom: at24: check suspend status before disable regulator

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")
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
Acked-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
This patch is originally in
https://patchwork.kernel.org/project/linux-mediatek/patch/20210414172916.2689361-5-hsinyi@chromium.org/
---
 drivers/misc/eeprom/at24.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 926408b41270..7a6f01ace78a 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -763,7 +763,8 @@ static int at24_probe(struct i2c_client *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 *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;
 	}
 
-- 
2.31.1.368.gbe11c130af-goog