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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>
This commit is contained in:
Olivier Moysan 2019-02-28 14:19:23 +01:00 committed by Mark Brown
parent b846819297
commit 26f98e82dd
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 1 deletions
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13
sound/soc/stm/stm32_sai_sub.c
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@ -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);