linux-kernel - Re: [RFC 7/8] drivers: introduce rpmsg, a remote-processor messaging bus

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Date:	Tue, 28 Jun 2011 16:51:01 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, akpm@...ux-foundation.org,
	Brian Swetland <swetland@...gle.com>,
	Arnd Bergmann <arnd@...db.de>,
	davinci-linux-open-source 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [RFC 7/8] drivers: introduce rpmsg, a remote-processor messaging bus

On Tue, Jun 28, 2011 at 4:46 PM, Ohad Ben-Cohen <ohad@...ery.com> wrote:
> Hi Grant,
>
> On Tue, Jun 28, 2011 at 1:21 AM, Grant Likely <grant.likely@...retlab.ca> wrote:
>>> +static int rpmsg_remove_device(struct device *dev, void *data)
>>> +{
>>> +     struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
>>> +
>>> +     device_unregister(dev);
>>> +
>>> +     kfree(rpdev);
>>
>> put_device() I think.
>
> Don't think so, we get the device handle from device_for_each_child
> here, which doesn't call get_device (unlike device_find_child).

It's not the device_for_each_child() that you're 'putting' back from
here.  Its the original kref initialization when the device was
created.  Once a device is initialized, it must never be directly
kfree()'d.

g.
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