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From:   Olivier Moysan <olivier.moysan@st.com>
To:     <lgirdwood@gmail.com>, <broonie@kernel.org>, <perex@perex.cz>,
        <tiwai@suse.com>, <mcoquelin.stm32@gmail.com>,
        <alexandre.torgue@st.com>, <alsa-devel@alsa-project.org>,
        <robh@kernel.org>, <mark.rutland@arm.com>,
        <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <kernel@stlinux.com>,
        <linux-kernel@vger.kernel.org>, <olivier.moysan@st.com>
CC:     <arnaud.pouliquen@st.com>, <benjamin.gaignard@st.com>
Subject: [INTERNAL][PATCH 4/7] ASoC: stm32: sai: fix stop management in isr
Date:   Thu, 19 Oct 2017 15:03:20 +0200
Message-ID: <1508418203-16840-5-git-send-email-olivier.moysan@st.com>
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Add check on substream validity.

Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
---
 sound/soc/stm/stm32_sai_sub.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c
index 2af397d..815ef10 100644
--- a/sound/soc/stm/stm32_sai_sub.c
+++ b/sound/soc/stm/stm32_sai_sub.c
@@ -184,7 +184,6 @@ static bool stm32_sai_sub_writeable_reg(struct device *dev, unsigned int reg)
 static irqreturn_t stm32_sai_isr(int irq, void *devid)
 {
 	struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid;
-	struct snd_pcm_substream *substream = sai->substream;
 	struct platform_device *pdev = sai->pdev;
 	unsigned int sr, imr, flags;
 	snd_pcm_state_t status = SNDRV_PCM_STATE_RUNNING;
@@ -199,6 +198,11 @@ static irqreturn_t stm32_sai_isr(int irq, void *devid)
 	regmap_update_bits(sai->regmap, STM_SAI_CLRFR_REGX, SAI_XCLRFR_MASK,
 			   SAI_XCLRFR_MASK);
 
+	if (!sai->substream) {
+		dev_err(&pdev->dev, "Device stopped. Spurious IRQ 0x%x\n", sr);
+		return IRQ_NONE;
+	}
+
 	if (flags & SAI_XIMR_OVRUDRIE) {
 		dev_err(&pdev->dev, "IRQ %s\n",
 			STM_SAI_IS_PLAYBACK(sai) ? "underrun" : "overrun");
@@ -227,9 +231,9 @@ static irqreturn_t stm32_sai_isr(int irq, void *devid)
 	}
 
 	if (status != SNDRV_PCM_STATE_RUNNING) {
-		snd_pcm_stream_lock(substream);
-		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
-		snd_pcm_stream_unlock(substream);
+		snd_pcm_stream_lock(sai->substream);
+		snd_pcm_stop(sai->substream, SNDRV_PCM_STATE_XRUN);
+		snd_pcm_stream_unlock(sai->substream);
 	}
 
 	return IRQ_HANDLED;
-- 
1.9.1


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