linux-kernel - Re: [PATCH] staging: bcm2835-audio: Disconnect and free vchi_instance on module

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Message-ID: <20180423135024.GA2337@kroah.com>
Date:   Mon, 23 Apr 2018 15:50:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kirill Marinushkin <k.marinushkin@...il.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] staging: bcm2835-audio: Disconnect and free
 vchi_instance on module_exit()

On Tue, Apr 17, 2018 at 07:00:28AM +0200, Kirill Marinushkin wrote:
> In the current implementation, vchi_instance is inited during the first
> call of bcm2835_audio_open_connection(), and is never freed. It causes a
> memory leak when the module `snd_bcm2835` is removed.
> 
> Here is how this commit fixes it:
> 
> * the VCHI context (including vchi_instance) is created once in the
>   platform's devres
> * the VCHI context is allocated and connected once during module_init()
> * all created bcm2835_chips have a pointer to this VCHI context
> * bcm2835_audio_open_connection() can access the VCHI context through the
>   associated bcm2835_chip
> * the VCHI context is disconnected and freed once during module_exit()
> 
> After this commit is applied, I don't see other issues with the module's
> init/exit, so I also remove the associated TODO task.
> 
> Steps to reproduce the memory leak before this commit:

<snip>

Patch dropped due to kbuild complaints.

Please fix up and resend.

thanks,

greg k-h