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

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Date:	Fri, 1 Jul 2011 18:13:54 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Grant Likely <grant.likely@...retlab.ca>
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 Wed, Jun 29, 2011 at 6:43 PM, Grant Likely <grant.likely@...retlab.ca> wrote:
> So you are right that device_unregister drops the refcount to zero,
> but the code still needs to be fixed to not call kfree() directly.

Good point, thanks !

> It also looks like rpmsg_destroy_channel() needs to be fixed to remove
> the kfree call

Yes, I need to remove this direct kfree as well, and indeed just let
rpmsg_release_device do its thing when the last reference is dropped.

I should also remove the direct kfree when device_register fails: in
that case, I need only to put_device and let the release handler do
its thing too.

> and an extra put_device() call.

We need that extra put_device in rpmsg_destroy_channel because
device_find_child() is doing get_device before returning it.

Thanks, Grant!

Ohad.
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