The patch titled
leds-pca955x: add proper error handling and fix bogus memory handling
has been added to the -mm tree. Its filename is
leds-pca955x-add-proper-error-handling-and-fix-bogus-memory-handling.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: leds-pca955x: add proper error handling and fix bogus memory handling
From: Sven Wegener <sven.wegener@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Acked-by: Nate Case <ncase@xxxxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/leds/leds-pca955x.c | 72 ++++++++++++++++++----------------
1 file changed, 39 insertions(+), 33 deletions(-)
diff -puN drivers/leds/leds-pca955x.c~leds-pca955x-add-proper-error-handling-and-fix-bogus-memory-handling drivers/leds/leds-pca955x.c
--- a/drivers/leds/leds-pca955x.c~leds-pca955x-add-proper-error-handling-and-fix-bogus-memory-handling
+++ a/drivers/leds/leds-pca955x.c
@@ -248,11 +248,10 @@ static int __devinit pca955x_probe(struc
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 +281,46 @@ static int __devinit pca955x_probe(struc
}
}
+ 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 = kzalloc(sizeof(struct pca955x_led), GFP_KERNEL);
- if (!pca955x) {
- err = -ENOMEM;
- goto exit;
- }
+ 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, 32, "pca955x:%d", i);
}
- spin_lock_init(&pca955x->lock);
- pca955x->led_cdev.name = pca955x->name;
- pca955x->led_cdev.brightness_set =
- pca955x_led_set;
-
- /*
- * Client data is a pointer to the _first_ pca955x_led
- * struct
- */
- if (i == 0)
- i2c_set_clientdata(client, pca955x);
+ spin_lock_init(&pca955x[i].lock);
+
+ 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) {
+ while (i > 0) {
+ i--;
+ led_classdev_unregister(&pca955x[i].led_cdev);
+ }
+
+ goto exit;
+ }
}
/* Turn off LEDs */
@@ -336,23 +338,27 @@ static int __devinit pca955x_probe(struc
pca955x_write_psc(client, 1, 0);
return 0;
+
exit:
+ 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;
}
_
Patches currently in -mm which might be from sven.wegener@xxxxxxxxxxx are
leds-fsg-change-order-of-initialization-and-deinitialization.patch
leds-pca955x-add-proper-error-handling-and-fix-bogus-memory-handling.patch
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