linux-kernel - Re: [PATCH] [mtd] fixed faulty check

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Date:	Thu, 30 Jul 2009 20:43:51 +0530
From:	vimal singh <vimal.newwork@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Stoyan Gaydarov <sgayda2@...c.edu>, linux-kernel@...r.kernel.org,
	David.Woodhouse@...el.com, sr@...x.de, kay.sievers@...y.org,
	gregkh@...e.de, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH] [mtd] fixed faulty check

On Thu, Jul 30, 2009 at 8:23 PM, Sebastian Andrzej
Siewior<bigeasy@...utronix.de> wrote:
> Stoyan Gaydarov wrote:
>>>>
>>>> We have to and of_flash_remove() takes care of it.
>>>>
>>>
>>>
>>
>> Does this mean that the original patch is fine or does it still need the
>> kfree? From what i understand when going to err_out it will take care of
>> info using of_flash_remove() so then it is not needed in the if check.
>
> The original patch was fine but it leaked info. of_flash_remove() does the
> cleanup of info but only if it is part of driver's data (after the
> of_flash_remove()). So you have to call dev_set_drvdata(&dev->dev, info)
> earlier, after the kzalloc() to save the data or else there is no clean
> up.
>

Is this patch looks OK??


diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index 39d357b..d104cfc 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -204,7 +204,7 @@ static int __devinit of_flash_probe(struct of_device *dev,
 		dev_err(&dev->dev, "Malformed reg property on %s\n",
 				dev->node->full_name);
 		err = -EINVAL;
-		goto err_out;
+		goto err_flash_remove;
 	}
 	count /= reg_tuple_size;

@@ -212,14 +212,14 @@ static int __devinit of_flash_probe(struct of_device *dev,
 	info = kzalloc(sizeof(struct of_flash) +
 		       sizeof(struct of_flash_list) * count, GFP_KERNEL);
 	if (!info)
-		goto err_out;
-
-	mtd_list = kzalloc(sizeof(struct mtd_info) * count, GFP_KERNEL);
-	if (!info)
-		goto err_out;
+		goto err_flash_remove;

 	dev_set_drvdata(&dev->dev, info);

+	mtd_list = kzalloc(sizeof(struct mtd_info) * count, GFP_KERNEL);
+	if (!mtd_list)
+		goto err_flash_remove;
+
 	for (i = 0; i < count; i++) {
 		err = -ENXIO;
 		if (of_address_to_resource(dp, i, &res)) {
@@ -338,6 +338,7 @@ static int __devinit of_flash_probe(struct of_device *dev,

 err_out:
 	kfree(mtd_list);
+eerr_flash_remov:
 	of_flash_remove(dev);

 	return err;
--
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