linux-kernel - Re: [PATCH v1 1/2] ASoC: rsnd: ssi: fix race condition in rsnd_ssi_pointer

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Message-ID: <87y3me7uce.wl%kuninori.morimoto.gx@renesas.com>
Date:   Thu, 7 Dec 2017 09:45:45 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     <jiada_wang@...tor.com>
Cc:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] ASoC: rsnd: ssi: fix race condition in rsnd_ssi_pointer_update


Hi Jiada

Thank you for your patch

> Currently there is race condition between set of byte_pos and wrap
> it around when new buffer starts. If .pointer is called in-between
> it will result in inconsistent pointer position be returned
> from .pointer callback.
> 
> This patch increments buffer pointer atomically to avoid this issue.
> 
> Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
> Reviewed-by: Takashi Sakamoto <takashi.sakamoto@...aclelinux.com>
> ---

You using playback with PIO mode ?
Because this function is no longer used on DMA mode

Best regards
---
Kuninori Morimoto