linux-kernel - RE: [PATCH v2 3/3] ASoC: sh: rz-ssi: Release the DMA channels in rz_ssi

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Date:   Tue, 26 Apr 2022 13:48:05 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        Pavel Machek <pavel@...x.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH v2 3/3] ASoC: sh: rz-ssi: Release the DMA channels in
 rz_ssi_probe() error path

Hi Lad Prabhakar,

Thanks for the patch.

> Subject: [PATCH v2 3/3] ASoC: sh: rz-ssi: Release the DMA channels in
> rz_ssi_probe() error path
> 
> DMA channels requested by rz_ssi_dma_request() in rz_ssi_probe() were
> never released in the error path apart from one place. This patch fixes
> this issue by calling rz_ssi_release_dma_channels() in the error path.
> 
> Fixes: 26ac471c5354 ("ASoC: sh: rz-ssi: Add SSI DMAC support")
> Reported-by: Pavel Machek <pavel@...x.de>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v1->v2
> * Dropped devers action and instead called rz_ssi_release_dma_channels()
>   in the error path.
> ---
>  sound/soc/sh/rz-ssi.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c index
> d9a684e71ec3..e392de7a262e 100644
> --- a/sound/soc/sh/rz-ssi.c
> +++ b/sound/soc/sh/rz-ssi.c
> @@ -976,14 +976,18 @@ static int rz_ssi_probe(struct platform_device
> *pdev)
> 
>  	/* Error Interrupt */
>  	ssi->irq_int = platform_get_irq_byname(pdev, "int_req");
> -	if (ssi->irq_int < 0)
> +	if (ssi->irq_int < 0) {
> +		rz_ssi_release_dma_channels(ssi);
>  		return ssi->irq_int;
> +	}
> 
>  	ret = devm_request_irq(&pdev->dev, ssi->irq_int, &rz_ssi_interrupt,
>  			       0, dev_name(&pdev->dev), ssi);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		rz_ssi_release_dma_channels(ssi);
>  		return dev_err_probe(&pdev->dev, ret,
>  				     "irq request error (int_req)\n");
> +	}
> 
>  	if (!rz_ssi_is_dma_enabled(ssi)) {
>  		/* Tx and Rx interrupts (pio only) */ @@ -1011,13 +1015,16 @@
> static int rz_ssi_probe(struct platform_device *pdev)
>  	}
> 
>  	ssi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
> -	if (IS_ERR(ssi->rstc))
> +	if (IS_ERR(ssi->rstc)) {
> +		rz_ssi_release_dma_channels(ssi);
>  		return PTR_ERR(ssi->rstc);
> +	}

May be we could move reset handle get above DMA channel request??

Cheers,
Biju

> 
>  	reset_control_deassert(ssi->rstc);
>  	pm_runtime_enable(&pdev->dev);
>  	ret = pm_runtime_resume_and_get(&pdev->dev);
>  	if (ret < 0) {
> +		rz_ssi_release_dma_channels(ssi);
>  		pm_runtime_disable(ssi->dev);
>  		reset_control_assert(ssi->rstc);
>  		return dev_err_probe(ssi->dev, ret, "pm_runtime_resume_and_get
> failed\n");
> --
> 2.25.1