diff options
| author | Olivier Moysan <olivier.moysan@st.com> | 2019-02-28 14:19:23 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-03-03 23:39:35 +0000 |
| commit | 26f98e82dd49b7c3cc5ef0edd882aa732a62b672 (patch) | |
| tree | 40bf947210a80edf03bf26a9055d6119606cae79 /sound | |
| parent | b8468192971807c43a80d6e2c41f83141cb7b211 (diff) | |
| download | linux-26f98e82dd49b7c3cc5ef0edd882aa732a62b672.tar.bz2 | |
ASoC: stm32: sai: fix race condition in irq handler
When snd_pcm_stop_xrun() is called in interrupt routine,
substream context may have already been released.
Add protection on substream context.
Signed-off-by: Olivier Moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/stm/stm32_sai_sub.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c index e418f446e03b..cad415e03b5e 100644 --- a/sound/soc/stm/stm32_sai_sub.c +++ b/sound/soc/stm/stm32_sai_sub.c @@ -102,6 +102,7 @@ * @spdif_frm_cnt: S/PDIF playback frame counter * @iec958: iec958 data * @ctrl_lock: control lock + * @irq_lock: prevent race condition with IRQ */ struct stm32_sai_sub_data { struct platform_device *pdev; @@ -133,6 +134,7 @@ struct stm32_sai_sub_data { unsigned int spdif_frm_cnt; struct snd_aes_iec958 iec958; struct mutex ctrl_lock; /* protect resources accessed by controls */ + spinlock_t irq_lock; /* used to prevent race condition with IRQ */ }; enum stm32_sai_fifo_th { @@ -474,8 +476,10 @@ static irqreturn_t stm32_sai_isr(int irq, void *devid) status = SNDRV_PCM_STATE_XRUN; } - if (status != SNDRV_PCM_STATE_RUNNING) + spin_lock(&sai->irq_lock); + if (status != SNDRV_PCM_STATE_RUNNING && sai->substream) snd_pcm_stop_xrun(sai->substream); + spin_unlock(&sai->irq_lock); return IRQ_HANDLED; } @@ -679,8 +683,11 @@ static int stm32_sai_startup(struct snd_pcm_substream *substream, { struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); int imr, cr2, ret; + unsigned long flags; + spin_lock_irqsave(&sai->irq_lock, flags); sai->substream = substream; + spin_unlock_irqrestore(&sai->irq_lock, flags); if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { snd_pcm_hw_constraint_mask64(substream->runtime, @@ -1059,6 +1066,7 @@ static void stm32_sai_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX, SAI_XIMR_MASK, 0); @@ -1069,7 +1077,9 @@ static void stm32_sai_shutdown(struct snd_pcm_substream *substream, clk_rate_exclusive_put(sai->sai_mclk); + spin_lock_irqsave(&sai->irq_lock, flags); sai->substream = NULL; + spin_unlock_irqrestore(&sai->irq_lock, flags); } static int stm32_sai_pcm_new(struct snd_soc_pcm_runtime *rtd, @@ -1433,6 +1443,7 @@ static int stm32_sai_sub_probe(struct platform_device *pdev) sai->pdev = pdev; mutex_init(&sai->ctrl_lock); + spin_lock_init(&sai->irq_lock); platform_set_drvdata(pdev, sai); sai->pdata = dev_get_drvdata(pdev->dev.parent); |