Hi Zheyu,
On Sat, Apr 09, 2022 at 10:26:29AM +0800, Zheyu Ma wrote:
> When the driver fails to probe, we will get the following splat:
>
> [ 19.311970] ------------[ cut here ]------------
> [ 19.312566] WARNING: CPU: 3 PID: 375 at drivers/regulator/core.c:2257 _regulator_put+0x3ec/0x4e0
> [ 19.317591] RIP: 0010:_regulator_put+0x3ec/0x4e0
> [ 19.328831] Call Trace:
> [ 19.329112] <TASK>
> [ 19.329369] regulator_bulk_free+0x82/0xe0
> [ 19.329860] devres_release_group+0x319/0x3d0
> [ 19.330357] i2c_device_probe+0x766/0x940
>
> Fix this by adding a callback that will deal with the disabling when the
> driver fails to probe.
>
> Signed-off-by: Zheyu Ma <zheyuma97@xxxxxxxxx>
> ---
> drivers/input/keyboard/cypress-sf.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/input/keyboard/cypress-sf.c b/drivers/input/keyboard/cypress-sf.c
> index c28996028e80..798611b76de6 100644
> --- a/drivers/input/keyboard/cypress-sf.c
> +++ b/drivers/input/keyboard/cypress-sf.c
> @@ -61,6 +61,13 @@ static irqreturn_t cypress_sf_irq_handler(int irq, void *devid)
> return IRQ_HANDLED;
> }
>
> +static void cypress_sf_disable_regulator(void *arg)
> +{
> + struct cypress_sf_data *data = arg;
> +
> + regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
> +}
> +
> static int cypress_sf_probe(struct i2c_client *client)
> {
> struct cypress_sf_data *touchkey;
> @@ -84,6 +91,10 @@ static int cypress_sf_probe(struct i2c_client *client)
> return error;
> }
>
> + error = devm_add_action_or_reset(&client->dev, cypress_sf_disable_regulator, touchkey);
> + if (error)
> + return error;
This needs to be moved to the spot after we enabled regulators. I
adjusted and applied.
> +
> touchkey->num_keys = device_property_read_u32_array(&client->dev,
> "linux,keycodes",
> NULL, 0);
> --
> 2.25.1
>
Thanks.
--
Dmitry
