diff options
| author | Zev Weiss <zev@bewilderbeest.net> | 2022-08-10 08:26:46 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2022-08-10 16:37:01 +0300 |
| commit | f4e6960f4f16b1ca5da16cec7612ecc86402ac05 (patch) | |
| tree | 97d59bedcf95242153ac19413e82955213bfe979 /drivers/hwmon/nct6775-core.c | |
| parent | 7aeef1548ac026c8bcb9ec223b672f81da340011 (diff) | |
| download | linux-f4e6960f4f16b1ca5da16cec7612ecc86402ac05.tar.xz | |
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.
As it turns out, there is no guarantee that nct6775_update_device()
is ever called prior to suspend. If this happens, the resume function
ends up writing bad data into the various chip registers, which results
in a crash shortly after resume.
To fix the problem, just add the symbol export and return to using
nct6775_update_device() as was employed previously.
Reported-by: Zoltán Kővágó <dirty.ice.hu@gmail.com>
Tested-by: Zoltán Kővágó <dirty.ice.hu@gmail.com>
Fixes: c3963bc0a0cf ("hwmon: (nct6775) Split core and platform driver")
Cc: stable@kernel.org
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Link: https://lore.kernel.org/r/20220810052646.13825-1-zev@bewilderbeest.net
[groeck: Updated description]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/nct6775-core.c')
| -rw-r--r-- | drivers/hwmon/nct6775-core.c | 3 |
1 files changed, 2 insertions, 1 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 @@ out: mutex_unlock(&data->update_lock); return err ? ERR_PTR(err) : data; } +EXPORT_SYMBOL_GPL(nct6775_update_device); /* * Sysfs callback functions |