linux-kernel - Re: [PATCH 3/3] sound/soc/au1x: keep pointer to resource so it can be freed

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Message-ID: <Pine.LNX.4.64.1110191709010.31584@ask.diku.dk>
Date:	Wed, 19 Oct 2011 17:09:30 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Manuel Lauss <manuel.lauss@...glemail.com>
Cc:	Liam Girdwood <lrg@...com>, kernel-janitors@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Axel Lin <axel.lin@...il.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] sound/soc/au1x: keep pointer to resource so it can
 be freed

On Wed, 19 Oct 2011, Manuel Lauss wrote:

> On Tue, Oct 18, 2011 at 5:45 AM, Julia Lawall <julia@...u.dk> wrote:
> > From: Julia Lawall <julia@...u.dk>
> >
> > Add a new variable for storing resources accessed subsequent to the one
> > accessed using request_mem_region, so the one accessed using
> > request_mem_region can be released if needed.
> >
> > This code is also missing some calls to iounmap.
> 
> How about something much simpler, like this:

If you like, I guess.  But I don't think I have seen that done before...

julia

> From 940e38b3f0beff6fcd8f62f627dce622e9ca0e54 Mon Sep 17 00:00:00 2001
> From: Manuel Lauss <manuel.lauss@...glemail.com>
> Date: Wed, 19 Oct 2011 16:45:12 +0200
> Subject: [PATCH] ASoC: au1x: fix error paths in ac97c/i2cs probe callbacks.
> 
> add iounmap() and release the correct mem resource.
> 
> Signed-off-by: Manuel Lauss <manuel.lauss@...glemail.com>
> ---
>  sound/soc/au1x/ac97c.c |    7 +++++--
>  sound/soc/au1x/i2sc.c  |    7 +++++--
>  2 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/au1x/ac97c.c b/sound/soc/au1x/ac97c.c
> index 13802ff..4ec39aa 100644
> --- a/sound/soc/au1x/ac97c.c
> +++ b/sound/soc/au1x/ac97c.c
> @@ -251,12 +251,12 @@ static int __devinit au1xac97c_drvprobe(struct
> platform_device *pdev)
> 
>  	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
>  	if (!r)
> -		goto out1;
> +		goto out2;
>  	ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = r->start;
> 
>  	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
>  	if (!r)
> -		goto out1;
> +		goto out2;
>  	ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = r->start;
> 
>  	/* switch it on */
> @@ -275,7 +275,10 @@ static int __devinit au1xac97c_drvprobe(struct
> platform_device *pdev)
>  	ac97c_workdata = ctx;
>  	return 0;
> 
> +out2:
> +	iounmap(ctx->mmio);
>  out1:
> +	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	release_mem_region(r->start, resource_size(r));
>  out0:
>  	kfree(ctx);
> diff --git a/sound/soc/au1x/i2sc.c b/sound/soc/au1x/i2sc.c
> index 19e0d2a..59fb31a 100644
> --- a/sound/soc/au1x/i2sc.c
> +++ b/sound/soc/au1x/i2sc.c
> @@ -251,12 +251,12 @@ static int __devinit au1xi2s_drvprobe(struct
> platform_device *pdev)
> 
>  	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
>  	if (!r)
> -		goto out1;
> +		goto out2;
>  	ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = r->start;
> 
>  	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
>  	if (!r)
> -		goto out1;
> +		goto out2;
>  	ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = r->start;
> 
>  	platform_set_drvdata(pdev, ctx);
> @@ -267,7 +267,10 @@ static int __devinit au1xi2s_drvprobe(struct
> platform_device *pdev)
> 
>  	return 0;
> 
> +out2:
> +	iounmap(ctx->mmio);
>  out1:
> +	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	release_mem_region(r->start, resource_size(r));
>  out0:
>  	kfree(ctx);
> -- 
> 1.7.7
> --
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