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authorOlivier Moysan <olivier.moysan@st.com>2019-02-28 14:19:23 +0100
committerMark Brown <broonie@kernel.org>2019-03-03 23:39:35 +0000
commit26f98e82dd49b7c3cc5ef0edd882aa732a62b672 (patch)
tree40bf947210a80edf03bf26a9055d6119606cae79 /sound/soc/stm/stm32_sai_sub.c
parentb8468192971807c43a80d6e2c41f83141cb7b211 (diff)
downloadlinux-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/soc/stm/stm32_sai_sub.c')
-rw-r--r--sound/soc/stm/stm32_sai_sub.c13
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);