linux-kernel - Re: [PATCH] drivers/w1: free the w1_master at w1_free

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Date:	Wed, 20 Jun 2012 18:27:26 +0530
From:	"devendra.aaru" <devendra.aaru@...il.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/w1: free the w1_master at w1_free_dev and return
 a correct return value

Hi Evgeniy,
On Wed, Jun 20, 2012 at 1:36 PM, Evgeniy Polyakov <zbr@...emap.net> wrote:
> Hi
>
> On Sun, Jun 17, 2012 at 09:47:59PM +0530, Devendra Naga (devendra.aaru@...il.com) wrote:
>> the w1_master pointer is allced at the w1_alloc_master and is not freed when called with
>> w1_remove_master.
>>
>> when w1_alloc_dev fails the return should be -ENODEV as it does
>> device_register, and that is the last case where that function
>> will fail.
>>
>> Signed-off-by: Devendra Naga <devendra.aaru@...il.com>
>
> Hmm, looks correct, but I wonder how whatever_free() function happend
> not to free its arguments.
>
I think , it its good to have the kfree after calling the w1_free_dev
as this way looks so wierd calling of kfree.
> Looks like device_unregister() calls release callback, but we do not
> provide one.
>
vim -t device_unregister points me to drivers/base/core.c
device_unregister function, where we do a device_del, where we do a
dev_release_all where it calls  release_nodes which calls the release
callback. is that what you are telling?

if so actually we are passing the structure w1_master_device which is
of struct device. its having a release callback. and there we free the
master device.

please suggest me if i mistaken....
> Greg, please pull it into your tree. Thank you.
> Acked-by: Evgeniy Polyakov <zbr@...emap.net>
>
> --
>        Evgeniy Polyakov

Thanks,
Devendra.
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