There are different init functions for the sensors in this driver in
which only one initialize the generic vcnl4000_lock. With commit
e21b5b1f2669 ("iio: light: vcnl4000: Preserve conf bits when toggle power")
the vcnl4040 sensor started to depend on the lock, but it was missed to
initialize it in vcnl4040's init function. This has not been visible
until we run lockdep on it:
DEBUG_LOCKS_WARN_ON(lock->magic != lock)
at kernel/locking/mutex.c:575 __mutex_lock+0x4f8/0x890
Call trace:
__mutex_lock
mutex_lock_nested
vcnl4200_set_power_state
vcnl4200_init
vcnl4000_probe
i2c_device_probe
really_probe
__driver_probe_device
driver_probe_device
__driver_attach
bus_for_each_dev
driver_attach
bus_add_driver
driver_register
i2c_register_driver
vcnl4000_driver_init
do_one_initcall
do_init_module
load_module
__do_sys_finit_module
Fix this by initializing the lock in the probe function instead of doing
it in the chip specific init functions.
Fixes: e21b5b1f2669 ("iio: light: vcnl4000: Preserve conf bits when toggle power")
Signed-off-by: Mårten Lindahl <marten.lindahl@xxxxxxxx>
---
v2:
- Trimmed backtrace in commit message
- Have 12 digit sha-1 id in Fixes tag
- Make the lock initialization in probe instead of in _init function
drivers/iio/light/vcnl4000.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index b5d398228289..caa2fff9f486 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -208,7 +208,6 @@ static int vcnl4000_init(struct vcnl4000_data *data)
data->rev = ret & 0xf;
data->al_scale = 250000;
- mutex_init(&data->vcnl4000_lock);
return data->chip_spec->set_power_state(data, true);
};
@@ -1366,6 +1365,7 @@ static int vcnl4000_probe(struct i2c_client *client,
data->client = client;
data->id = id->driver_data;
data->chip_spec = &vcnl4000_chip_spec_cfg[data->id];
+ mutex_init(&data->vcnl4000_lock);
ret = data->chip_spec->init(data);
if (ret < 0)
--
2.30.2
