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leds-pca955x: add proper error handling and fix bogus memory handling

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Check the return value of led_classdev_register and unregister all
registered devices, if registering one device fails.  Also the dynamic
memory handling is totally bogus.  You can't allocate multiple chunks via
kzalloc() and expect them to be in order later.  I wonder how this ever
worked.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Acked-by: Nate Case <ncase@xes-inc.com>
Tested-by: Nate Case <ncase@xes-inc.com>
Acked-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sven Wegener 2008-10-03 15:23:48 -07:00 committed by Linus Torvalds
parent 07f696c777
commit 95bf14bff5
1 changed files with 39 additions and 33 deletions
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72
drivers/leds/leds-pca955x.c
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@ -248,11 +248,10 @@ static int __devinit pca955x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca955x_led *pca955x;
int i;
int err = -ENODEV;
struct pca955x_chipdef *chip;
struct i2c_adapter *adapter;
struct led_platform_data *pdata;
int i, err;
chip = &pca955x_chipdefs[id->driver_data];
adapter = to_i2c_adapter(client->dev.parent);
@ -282,43 +281,41 @@ static int __devinit pca955x_probe(struct i2c_client *client,
}
}
for (i = 0; i < chip->bits; i++) {
pca955x = kzalloc(sizeof(struct pca955x_led), GFP_KERNEL);
if (!pca955x) {
err = -ENOMEM;
goto exit;
}
pca955x = kzalloc(sizeof(*pca955x) * chip->bits, GFP_KERNEL);
if (!pca955x)
return -ENOMEM;
i2c_set_clientdata(client, pca955x);
for (i = 0; i < chip->bits; i++) {
pca955x[i].chipdef = chip;
pca955x[i].client = client;
pca955x[i].led_num = i;
pca955x->chipdef = chip;
pca955x->client = client;
pca955x->led_num = i;
/* Platform data can specify LED names and default triggers */
if (pdata) {
if (pdata->leds[i].name)
snprintf(pca955x->name, 32, "pca955x:%s",
pdata->leds[i].name);
snprintf(pca955x[i].name,
sizeof(pca955x[i].name), "pca955x:%s",
pdata->leds[i].name);
if (pdata->leds[i].default_trigger)
pca955x->led_cdev.default_trigger =
pca955x[i].led_cdev.default_trigger =
pdata->leds[i].default_trigger;
} else {
snprintf(pca955x->name, 32, "pca955x:%d", i);
snprintf(pca955x[i].name, sizeof(pca955x[i].name),
"pca955x:%d", i);
}
spin_lock_init(&pca955x->lock);
pca955x->led_cdev.name = pca955x->name;
pca955x->led_cdev.brightness_set =
pca955x_led_set;
spin_lock_init(&pca955x[i].lock);
/*
* Client data is a pointer to the _first_ pca955x_led
* struct
*/
if (i == 0)
i2c_set_clientdata(client, pca955x);
pca955x[i].led_cdev.name = pca955x[i].name;
pca955x[i].led_cdev.brightness_set = pca955x_led_set;
INIT_WORK(&(pca955x->work), pca955x_led_work);
INIT_WORK(&pca955x[i].work, pca955x_led_work);
led_classdev_register(&client->dev, &(pca955x->led_cdev));
err = led_classdev_register(&client->dev, &pca955x[i].led_cdev);
if (err < 0)
goto exit;
}
/* Turn off LEDs */
@ -336,23 +333,32 @@ static int __devinit pca955x_probe(struct i2c_client *client,
pca955x_write_psc(client, 1, 0);
return 0;
exit:
while (i--) {
led_classdev_unregister(&pca955x[i].led_cdev);
cancel_work_sync(&pca955x[i].work);
}
kfree(pca955x);
i2c_set_clientdata(client, NULL);
return err;
}
static int __devexit pca955x_remove(struct i2c_client *client)
{
struct pca955x_led *pca955x = i2c_get_clientdata(client);
int leds = pca955x->chipdef->bits;
int i;
for (i = 0; i < leds; i++) {
led_classdev_unregister(&(pca955x->led_cdev));
cancel_work_sync(&(pca955x->work));
kfree(pca955x);
pca955x = pca955x + 1;
for (i = 0; i < pca955x->chipdef->bits; i++) {
led_classdev_unregister(&pca955x[i].led_cdev);
cancel_work_sync(&pca955x[i].work);
}
kfree(pca955x);
i2c_set_clientdata(client, NULL);
return 0;
}