misc: eeprom: at24: check suspend status before disable regulator

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@vger.kernel.org>
Acked-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Link: https://lore.kernel.org/r/20210420133050.377209-1-hsinyi@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 926408b..7a6f01a 100644 (file)
--- 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;
        }