Input: cypress-sf - register a callback to disable the regulators

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@gmail.com>
Link: https://lore.kernel.org/r/20220409022629.3493557-1-zheyuma97@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/keyboard/cypress-sf.c b/drivers/input/keyboard/cypress-sf.c
index c289960..9a23eed 100644 (file)
--- a/drivers/input/keyboard/cypress-sf.c
+++ b/drivers/input/keyboard/cypress-sf.c
@@ -61,6 +61,14 @@ static irqreturn_t cypress_sf_irq_handler(int irq, void *devid)
        return IRQ_HANDLED;
 }
 
+static void cypress_sf_disable_regulators(void *arg)
+{
+       struct cypress_sf_data *touchkey = arg;
+
+       regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators),
+                              touchkey->regulators);
+}
+
 static int cypress_sf_probe(struct i2c_client *client)
 {
        struct cypress_sf_data *touchkey;
@@ -121,6 +129,12 @@ static int cypress_sf_probe(struct i2c_client *client)
                return error;
        }
 
+       error = devm_add_action_or_reset(&client->dev,
+                                        cypress_sf_disable_regulators,
+                                        touchkey);
+       if (error)
+               return error;
+
        touchkey->input_dev = devm_input_allocate_device(&client->dev);
        if (!touchkey->input_dev) {
                dev_err(&client->dev, "Failed to allocate input device\n");