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Input: edt-ft5x06 - fix regmap leak when probe fails

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The driver neglects to free the instance of I2C regmap constructed at
the beginning of the edt_ft5x06_ts_probe() method when probe fails.
Additionally edt_ft5x06_ts_remove() is freeing the regmap too early,
before the rest of the device resources that are managed by devm are
released.

Fix this by installing a custom devm action that will ensure that the
regmap is released at the right time during normal teardown as well as
in case of probe failure.

Note that devm_regmap_init_i2c() could not be used because the driver
may replace the original regmap with a regmap specific for M06 devices
in the middle of the probe, and using devm_regmap_init_i2c() would
result in releasing the M06 regmap too early.

Reported-by: Li Zetao <lizetao1@huawei.com>
Fixes: 9dfd9708ff ("Input: edt-ft5x06 - convert to use regmap API")
Cc: stable@vger.kernel.org
Reviewed-by: Oliver Graute <oliver.graute@kococonnector.com>
Link: https://lore.kernel.org/r/ZxL6rIlVlgsAu-Jv@google.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2024-10-18 17:17:48 -07:00
parent 2de01e0e57
commit bffdf9d7e5
1 changed files with 18 additions and 1 deletions
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19
drivers/input/touchscreen/edt-ft5x06.c
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@ -1121,6 +1121,14 @@ static void edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
}
}
static void edt_ft5x06_exit_regmap(void *arg)
{
struct edt_ft5x06_ts_data *data = arg;
if (!IS_ERR_OR_NULL(data->regmap))
regmap_exit(data->regmap);
}
static void edt_ft5x06_disable_regulators(void *arg)
{
struct edt_ft5x06_ts_data *data = arg;
@ -1154,6 +1162,16 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client)
return PTR_ERR(tsdata->regmap);
}
/*
* We are not using devm_regmap_init_i2c() and instead install a
* custom action because we may replace regmap with M06-specific one
* and we need to make sure that it will not be released too early.
*/
error = devm_add_action_or_reset(&client->dev, edt_ft5x06_exit_regmap,
tsdata);
if (error)
return error;
chip_data = device_get_match_data(&client->dev);
if (!chip_data)
chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
@ -1347,7 +1365,6 @@ static void edt_ft5x06_ts_remove(struct i2c_client *client)
struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
edt_ft5x06_ts_teardown_debugfs(tsdata);
regmap_exit(tsdata->regmap);
}
static int edt_ft5x06_ts_suspend(struct device *dev)