linux-kernel - [PATCH] hwmon: (nct6775) Fix platform driver suspend regression

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Date:   Tue,  9 Aug 2022 22:26:46 -0700
From:   Zev Weiss <zev@...ilderbeest.net>
To:     linux-hwmon@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-kernel@...r.kernel.org,
        Zev Weiss <zev@...ilderbeest.net>,
        Zoltán Kővágó 
        <dirty.ice.hu@...il.com>, stable@...nel.org
Subject: [PATCH] hwmon: (nct6775) Fix platform driver suspend regression

Commit c3963bc0a0cf ("hwmon: (nct6775) Split core and platform
driver") introduced a slight change in nct6775_suspend() in order to
avoid an otherwise-needless symbol export for nct6775_update_device(),
replacing a call to that function with a simple dev_get_drvdata()
instead.

Though the exact details of how this happens aren't yet fully known,
it turns out that this breaks suspend/resume in at least some
circumstances.  To fix this (possibly only temporarily until the
problem is better understood), just add the symbol export and return
to using nct6775_update_device() as was employed previously.

Reported-by: Zoltán Kővágó <dirty.ice.hu@...il.com>
Tested-by: Zoltán Kővágó <dirty.ice.hu@...il.com>
Fixes: c3963bc0a0cf ("hwmon: (nct6775) Split core and platform driver")
Cc: stable@...nel.org
Signed-off-by: Zev Weiss <zev@...ilderbeest.net>
---
 drivers/hwmon/nct6775-core.c     | 3 ++-
 drivers/hwmon/nct6775-platform.c | 2 +-
 drivers/hwmon/nct6775.h          | 2 ++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c
index 446964cbae4c..da9ec6983e13 100644
--- a/drivers/hwmon/nct6775-core.c
+++ b/drivers/hwmon/nct6775-core.c
@@ -1480,7 +1480,7 @@ static int nct6775_update_pwm_limits(struct device *dev)
 	return 0;
 }
 
-static struct nct6775_data *nct6775_update_device(struct device *dev)
+struct nct6775_data *nct6775_update_device(struct device *dev)
 {
 	struct nct6775_data *data = dev_get_drvdata(dev);
 	int i, j, err = 0;
@@ -1615,6 +1615,7 @@ static struct nct6775_data *nct6775_update_device(struct device *dev)
 	mutex_unlock(&data->update_lock);
 	return err ? ERR_PTR(err) : data;
 }
+EXPORT_SYMBOL_GPL(nct6775_update_device);
 
 /*
  * Sysfs callback functions
diff --git a/drivers/hwmon/nct6775-platform.c b/drivers/hwmon/nct6775-platform.c
index ab30437221ce..41c97cfacfb8 100644
--- a/drivers/hwmon/nct6775-platform.c
+++ b/drivers/hwmon/nct6775-platform.c
@@ -359,7 +359,7 @@ static int __maybe_unused nct6775_suspend(struct device *dev)
 {
 	int err;
 	u16 tmp;
-	struct nct6775_data *data = dev_get_drvdata(dev);
+	struct nct6775_data *data = nct6775_update_device(dev);
 
 	if (IS_ERR(data))
 		return PTR_ERR(data);
diff --git a/drivers/hwmon/nct6775.h b/drivers/hwmon/nct6775.h
index 93f708148e65..be41848c3cd2 100644
--- a/drivers/hwmon/nct6775.h
+++ b/drivers/hwmon/nct6775.h
@@ -196,6 +196,8 @@ static inline int nct6775_write_value(struct nct6775_data *data, u16 reg, u16 va
 	return regmap_write(data->regmap, reg, value);
 }
 
+struct nct6775_data *nct6775_update_device(struct device *dev);
+
 bool nct6775_reg_is_word_sized(struct nct6775_data *data, u16 reg);
 int nct6775_probe(struct device *dev, struct nct6775_data *data,
 		  const struct regmap_config *regmapcfg);
-- 
2.37.1