[PATCH -next] ASoC: sh: rz-ssi: Fix return value check in rz_ssi_dma_request()

[Biju Das]

Hi Yang Yingliang,

Thanks for your patch.

Already I have posted a patch for fixing it.

https://patchwork.kernel.org/project/alsa-devel/patch/20210814180120.18082-1-biju.das.jz@bp.renesas.com/

Since you posted a similar patch as Reported-by: Hulk Robot <hulkci at huawei.com>,
I am adding my Rb tag for this patch.

Regards,
Biju


> -----Original Message-----
> From: Yang Yingliang <yangyingliang at huawei.com>
> Sent: 17 August 2021 04:00
> To: linux-kernel at vger.kernel.org; alsa-devel at alsa-project.org
> Cc: broonie at kernel.org; Biju Das <biju.das.jz at bp.renesas.com>; Prabhakar
> Mahadev Lad <prabhakar.mahadev-lad.rj at bp.renesas.com>; lgirdwood at gmail.com
> Subject: [PATCH -next] ASoC: sh: rz-ssi: Fix return value check in
> rz_ssi_dma_request()
> 
> In case of error, the function dma_request_chan() returns ERR_PTR() and
> never returns NULL. Set 'dma_ch' to NULL, if dma_request_chan() returns
> error, so the code using 'dma_ch' can work correctly.
> 
> Fixes: 26ac471c5354 ("ASoC: sh: rz-ssi: Add SSI DMAC support")
> Reported-by: Hulk Robot <hulkci at huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang at huawei.com>

Reviewed-by: Biju Das <biju.das.jz at bp.renesas.com>

> ---
>  sound/soc/sh/rz-ssi.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c index
> ea8d33ede5d2..5ec78fd94d94 100644
> --- a/sound/soc/sh/rz-ssi.c
> +++ b/sound/soc/sh/rz-ssi.c
> @@ -676,11 +676,17 @@ static void rz_ssi_release_dma_channels(struct
> rz_ssi_priv *ssi)  static int rz_ssi_dma_request(struct rz_ssi_priv *ssi,
> struct device *dev)  {
>  	ssi->playback.dma_ch = dma_request_chan(dev, "tx");
> +	if (IS_ERR(ssi->playback.dma_ch))
> +		ssi->playback.dma_ch = NULL;
>  	ssi->capture.dma_ch = dma_request_chan(dev, "rx");
> +	if (IS_ERR(ssi->capture.dma_ch))
> +		ssi->capture.dma_ch = NULL;
>  	if (!ssi->playback.dma_ch && !ssi->capture.dma_ch) {
>  		ssi->playback.dma_ch = dma_request_chan(dev, "rt");
> -		if (!ssi->playback.dma_ch)
> +		if (IS_ERR(ssi->playback.dma_ch)) {
> +			ssi->playback.dma_ch = NULL;
>  			goto no_dma;
> +		}
> 
>  		ssi->dma_rt = true;
>  	}
> --
> 2.25.1