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Input: synaptics-rmi4 - fix error handling in I2C transport driver 

Instantiating the rmi4 I2C transport driver without interrupts assigned
(for example using manual i2c instantiation from the command line)
caused the driver to fail to load, but it does not clean up its regulator
or transport device registrations. Result is a crash at a later time,
for example when rebooting the system.

Fixes: 946c8432aa ("Input: synaptics-rmi4 - support regulator supplies")
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Guenter Roeck 2016-10-04 11:50:54 -07:00 committed by Dmitry Torokhov
parent bbc2ceeb32
commit 261d7794c4
1 changed files with 26 additions and 12 deletions
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38
drivers/input/rmi4/rmi_i2c.c
View File

@ -221,6 +221,21 @@ static const struct of_device_id rmi_i2c_of_match[] = {
MODULE_DEVICE_TABLE(of, rmi_i2c_of_match);
#endif
static void rmi_i2c_regulator_bulk_disable(void *data)
{
struct rmi_i2c_xport *rmi_i2c = data;
regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
rmi_i2c->supplies);
}
static void rmi_i2c_unregister_transport(void *data)
{
struct rmi_i2c_xport *rmi_i2c = data;
rmi_unregister_transport_device(&rmi_i2c->xport);
}
static int rmi_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -264,6 +279,12 @@ static int rmi_i2c_probe(struct i2c_client *client,
if (retval < 0)
return retval;
retval = devm_add_action_or_reset(&client->dev,
rmi_i2c_regulator_bulk_disable,
rmi_i2c);
if (retval)
return retval;
of_property_read_u32(client->dev.of_node, "syna,startup-delay-ms",
&rmi_i2c->startup_delay);
@ -294,6 +315,11 @@ static int rmi_i2c_probe(struct i2c_client *client,
client->addr);
return retval;
}
retval = devm_add_action_or_reset(&client->dev,
rmi_i2c_unregister_transport,
rmi_i2c);
if (retval)
return retval;
retval = rmi_i2c_init_irq(client);
if (retval < 0)
@ -304,17 +330,6 @@ static int rmi_i2c_probe(struct i2c_client *client,
return 0;
}
static int rmi_i2c_remove(struct i2c_client *client)
{
struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
rmi_unregister_transport_device(&rmi_i2c->xport);
regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
rmi_i2c->supplies);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int rmi_i2c_suspend(struct device *dev)
{
@ -431,7 +446,6 @@ static struct i2c_driver rmi_i2c_driver = {
},
.id_table = rmi_id,
.probe = rmi_i2c_probe,
.remove = rmi_i2c_remove,
};
module_i2c_driver(rmi_i2c_driver);