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Commit b119c6c9 authored by Jean Delvare's avatar Jean Delvare Committed by Greg Kroah-Hartman
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i2c: __must_check fixes (core drivers) 



i2c: __must_check fixes (core drivers)

Check for error on sysfs file creation.
Check for error on device registration.
Check for error on class device registration.

Greg, I am not familiar with completion, can you please tell me if I
need to take care of it in the error paths (as I did in this patch,
see /* Needed? */ comments), or if it isn't needed?

These patches were tested, including forced errors, so they should work
fine. But of course more testing can't hurt.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 22f76e74

drivers/i2c/busses/i2c-isa.c

+26 −3
Original line number Diff line number Diff line
@@ -125,6 +125,8 @@ int i2c_isa_del_driver(struct i2c_driver *driver) 


static int __init i2c_isa_init(void)

{

	int err;



	mutex_init(&isa_adapter.clist_lock);

	INIT_LIST_HEAD(&isa_adapter.clients);
@@ -133,8 +135,16 @@ static int __init i2c_isa_init(void) 
	sprintf(isa_adapter.dev.bus_id, "i2c-%d", isa_adapter.nr);

	isa_adapter.dev.driver = &i2c_adapter_driver;

	isa_adapter.dev.release = &i2c_adapter_dev_release;

	device_register(&isa_adapter.dev);

	device_create_file(&isa_adapter.dev, &dev_attr_name);

	err = device_register(&isa_adapter.dev);

	if (err) {

		printk(KERN_ERR "i2c-isa: Failed to register device\n");

		goto exit;

	}

	err = device_create_file(&isa_adapter.dev, &dev_attr_name);

	if (err) {

		printk(KERN_ERR "i2c-isa: Failed to create name file\n");

		goto exit_unregister;

	}



	/* Add this adapter to the i2c_adapter class */

	memset(&isa_adapter.class_dev, 0x00, sizeof(struct class_device));
@@ -142,11 +152,24 @@ static int __init i2c_isa_init(void) 
	isa_adapter.class_dev.class = &i2c_adapter_class;

	strlcpy(isa_adapter.class_dev.class_id, isa_adapter.dev.bus_id,

		BUS_ID_SIZE);

	class_device_register(&isa_adapter.class_dev);

	err = class_device_register(&isa_adapter.class_dev);

	if (err) {

		printk(KERN_ERR "i2c-isa: Failed to register class device\n");

		goto exit_remove_name;

	}



	dev_dbg(&isa_adapter.dev, "%s registered\n", isa_adapter.name);



	return 0;



exit_remove_name:

	device_remove_file(&isa_adapter.dev, &dev_attr_name);

exit_unregister:

	init_completion(&isa_adapter.dev_released); /* Needed? */

	device_unregister(&isa_adapter.dev);

	wait_for_completion(&isa_adapter.dev_released);

exit:

	return err;

}



static void __exit i2c_isa_exit(void)

drivers/i2c/i2c-core.c

+43 −10
Original line number Diff line number Diff line
@@ -183,15 +183,21 @@ int i2c_add_adapter(struct i2c_adapter *adap) 
	sprintf(adap->dev.bus_id, "i2c-%d", adap->nr);

	adap->dev.driver = &i2c_adapter_driver;

	adap->dev.release = &i2c_adapter_dev_release;

	device_register(&adap->dev);

	device_create_file(&adap->dev, &dev_attr_name);

	res = device_register(&adap->dev);

	if (res)

		goto out_list;

	res = device_create_file(&adap->dev, &dev_attr_name);

	if (res)

		goto out_unregister;



	/* Add this adapter to the i2c_adapter class */

	memset(&adap->class_dev, 0x00, sizeof(struct class_device));

	adap->class_dev.dev = &adap->dev;

	adap->class_dev.class = &i2c_adapter_class;

	strlcpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE);

	class_device_register(&adap->class_dev);

	res = class_device_register(&adap->class_dev);

	if (res)

		goto out_remove_name;



	dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
@@ -206,6 +212,17 @@ int i2c_add_adapter(struct i2c_adapter *adap) 
out_unlock:

	mutex_unlock(&core_lists);

	return res;



out_remove_name:

	device_remove_file(&adap->dev, &dev_attr_name);

out_unregister:

	init_completion(&adap->dev_released); /* Needed? */

	device_unregister(&adap->dev);

	wait_for_completion(&adap->dev_released);

out_list:

	list_del(&adap->list);

	idr_remove(&i2c_adapter_idr, adap->nr);

	goto out_unlock;

}
@@ -394,14 +411,14 @@ int i2c_check_addr(struct i2c_adapter *adapter, int addr) 
int i2c_attach_client(struct i2c_client *client)

{

	struct i2c_adapter *adapter = client->adapter;

	int res = 0;



	mutex_lock(&adapter->clist_lock);

	if (__i2c_check_addr(client->adapter, client->addr)) {

		mutex_unlock(&adapter->clist_lock);

		return -EBUSY;

		res = -EBUSY;

		goto out_unlock;

	}

	list_add_tail(&client->list,&adapter->clients);

	mutex_unlock(&adapter->clist_lock);

	

	if (adapter->client_register)  {

		if (adapter->client_register(client))  {
@@ -422,10 +439,26 @@ int i2c_attach_client(struct i2c_client *client) 
		"%d-%04x", i2c_adapter_id(adapter), client->addr);

	dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n",

		client->name, client->dev.bus_id);

	device_register(&client->dev);

	device_create_file(&client->dev, &dev_attr_client_name);

	res = device_register(&client->dev);

	if (res)

		goto out_list;

	res = device_create_file(&client->dev, &dev_attr_client_name);

	if (res)

		goto out_unregister;



	return 0;

out_unlock:

	mutex_unlock(&adapter->clist_lock);

	return res;



out_unregister:

	init_completion(&client->released); /* Needed? */

	device_unregister(&client->dev);

	wait_for_completion(&client->released);

out_list:

	list_del(&client->list);

	dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x "

		"(%d)\n", client->name, client->addr, res);

	goto out_unlock;

}