From patchwork Mon Jan 10 09:47:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12708541 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B51D6C433EF for ; Mon, 10 Jan 2022 09:48:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243530AbiAJJss (ORCPT ); Mon, 10 Jan 2022 04:48:48 -0500 Received: from relmlor2.renesas.com ([210.160.252.172]:44240 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S243306AbiAJJsE (ORCPT ); Mon, 10 Jan 2022 04:48:04 -0500 X-IronPort-AV: E=Sophos;i="5.88,276,1635174000"; d="scan'208";a="106545264" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 10 Jan 2022 18:48:03 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 1D68C4238CA4; Mon, 10 Jan 2022 18:48:00 +0900 (JST) From: Lad Prabhakar To: Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai Cc: Biju Das , Pavel Machek , linux-renesas-soc@vger.kernel.org, Prabhakar , Lad Prabhakar , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/5] ASoC: sh: rz-ssi: Add functions to get/set substream pointer Date: Mon, 10 Jan 2022 09:47:11 +0000 Message-Id: <20220110094711.8574-6-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220110094711.8574-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20220110094711.8574-1-prabhakar.mahadev-lad.rj@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org A copy of substream pointer is stored in priv structure during rz_ssi_dai_trigger() callback ie in SNDRV_PCM_TRIGGER_START case and the pointer is assigned to NULL in case of SNDRV_PCM_TRIGGER_STOP. The driver used the locks only in rz_ssi_stream_is_valid() and assigned the local substream pointer to NULL in rz_ssi_dai_trigger() callback and in rest of the driver no locking was used while assigning substream pointer. This patch adds functions to get/set substream pointer with locks acquired and replaces the instances of access to substream pointer with the get/set functions. Reported-by: Pavel Machek Signed-off-by: Lad Prabhakar Reviewed-by: Biju Das --- sound/soc/sh/rz-ssi.c | 55 ++++++++++++++++++++++++++++++++----------- 1 file changed, 41 insertions(+), 14 deletions(-) diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c index aabd15e9d515..057aedacedec 100644 --- a/sound/soc/sh/rz-ssi.c +++ b/sound/soc/sh/rz-ssi.c @@ -201,12 +201,36 @@ static bool rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi, return ret; } +static struct snd_pcm_substream *rz_ssi_get_substream(struct rz_ssi_stream *strm) +{ + struct rz_ssi_priv *ssi = strm->priv; + struct snd_pcm_substream *substream; + unsigned long flags; + + spin_lock_irqsave(&ssi->lock, flags); + substream = strm->substream; + spin_unlock_irqrestore(&ssi->lock, flags); + + return substream; +} + +static void rz_ssi_set_substream(struct rz_ssi_stream *strm, + struct snd_pcm_substream *substream) +{ + struct rz_ssi_priv *ssi = strm->priv; + unsigned long flags; + + spin_lock_irqsave(&ssi->lock, flags); + strm->substream = substream; + spin_unlock_irqrestore(&ssi->lock, flags); +} + static void rz_ssi_stream_init(struct rz_ssi_stream *strm, struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; - strm->substream = substream; + rz_ssi_set_substream(strm, substream); strm->sample_width = samples_to_bytes(runtime, 1); strm->dma_buffer_pos = 0; strm->period_counter = 0; @@ -223,12 +247,13 @@ static void rz_ssi_stream_init(struct rz_ssi_stream *strm, static void rz_ssi_stream_quit(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) { - struct snd_soc_dai *dai = rz_ssi_get_dai(strm->substream); - unsigned long flags; + struct snd_pcm_substream *substream; + struct snd_soc_dai *dai; - spin_lock_irqsave(&ssi->lock, flags); - strm->substream = NULL; - spin_unlock_irqrestore(&ssi->lock, flags); + substream = rz_ssi_get_substream(strm); + rz_ssi_set_substream(strm, NULL); + + dai = rz_ssi_get_dai(substream); if (strm->oerr_num > 0) dev_info(dai->dev, "overrun = %d\n", strm->oerr_num); @@ -301,7 +326,8 @@ static int rz_ssi_clk_setup(struct rz_ssi_priv *ssi, unsigned int rate, static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) { - bool is_play = rz_ssi_stream_is_play(ssi, strm->substream); + struct snd_pcm_substream *substream = rz_ssi_get_substream(strm); + bool is_play = rz_ssi_stream_is_play(ssi, substream); u32 ssicr, ssifcr; ssicr = rz_ssi_reg_readl(ssi, SSICR); @@ -382,7 +408,7 @@ static int rz_ssi_stop(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) static void rz_ssi_pointer_update(struct rz_ssi_stream *strm, int frames) { - struct snd_pcm_substream *substream = strm->substream; + struct snd_pcm_substream *substream = rz_ssi_get_substream(strm); struct snd_pcm_runtime *runtime; int current_period; @@ -399,14 +425,14 @@ static void rz_ssi_pointer_update(struct rz_ssi_stream *strm, int frames) current_period = strm->buffer_pos / runtime->period_size; if (strm->period_counter != current_period) { - snd_pcm_period_elapsed(strm->substream); + snd_pcm_period_elapsed(substream); strm->period_counter = current_period; } } static int rz_ssi_pio_recv(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) { - struct snd_pcm_substream *substream = strm->substream; + struct snd_pcm_substream *substream = rz_ssi_get_substream(strm); struct snd_pcm_runtime *runtime; bool done = false; u16 *buf; @@ -464,7 +490,7 @@ static int rz_ssi_pio_recv(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) static int rz_ssi_pio_send(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) { - struct snd_pcm_substream *substream = strm->substream; + struct snd_pcm_substream *substream = rz_ssi_get_substream(strm); struct snd_pcm_runtime *runtime = substream->runtime; int sample_space; int samples = 0; @@ -588,7 +614,7 @@ static int rz_ssi_dma_slave_config(struct rz_ssi_priv *ssi, static int rz_ssi_dma_transfer(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm) { - struct snd_pcm_substream *substream = strm->substream; + struct snd_pcm_substream *substream = rz_ssi_get_substream(strm); struct dma_async_tx_descriptor *desc; struct snd_pcm_runtime *runtime; enum dma_transfer_direction dir; @@ -646,12 +672,13 @@ static int rz_ssi_dma_transfer(struct rz_ssi_priv *ssi, static void rz_ssi_dma_complete(void *data) { struct rz_ssi_stream *strm = (struct rz_ssi_stream *)data; + struct snd_pcm_substream *substream = rz_ssi_get_substream(strm); - if (!strm->running || !strm->substream || !strm->substream->runtime) + if (!strm->running || !substream || !substream->runtime) return; /* Note that next DMA transaction has probably already started */ - rz_ssi_pointer_update(strm, strm->substream->runtime->period_size); + rz_ssi_pointer_update(strm, substream->runtime->period_size); /* Queue up another DMA transaction */ rz_ssi_dma_transfer(strm->priv, strm);