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authorOlivier Moysan <olivier.moysan@st.com>2019-02-26 14:51:09 +0100
committerMark Brown <broonie@kernel.org>2019-02-26 15:41:56 +0000
commit3005decf4fe43e65d882dce838716bd6715757c1 (patch)
tree71c26d76016fe3118630e49d86f3848751a1c431 /sound/soc
parent88dce52ee9b58b627cf75f5aeb53ab5ea6340472 (diff)
downloadlinux-stericsson-3005decf4fe43e65d882dce838716bd6715757c1.tar.gz
ASoC: stm32: i2s: 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')
-rw-r--r--sound/soc/stm/stm32_i2s.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c
index 9edb753ffa1b..42ce87a35104 100644
--- a/sound/soc/stm/stm32_i2s.c
+++ b/sound/soc/stm/stm32_i2s.c
@@ -201,6 +201,7 @@ enum i2s_datlen {
* @base: mmio register base virtual address
* @phys_addr: I2S registers physical base address
* @lock_fd: lock to manage race conditions in full duplex mode
+ * @irq_lock: prevent race condition with IRQ
* @dais_name: DAI name
* @mclk_rate: master clock frequency (Hz)
* @fmt: DAI protocol
@@ -222,6 +223,7 @@ struct stm32_i2s_data {
void __iomem *base;
dma_addr_t phys_addr;
spinlock_t lock_fd; /* Manage race conditions for full duplex */
+ spinlock_t irq_lock; /* used to prevent race condition with IRQ */
char dais_name[STM32_I2S_DAI_NAME_SIZE];
unsigned int mclk_rate;
unsigned int fmt;
@@ -263,8 +265,10 @@ static irqreturn_t stm32_i2s_isr(int irq, void *devid)
if (flags & I2S_SR_TIFRE)
dev_dbg(&pdev->dev, "Frame error\n");
- if (err)
+ spin_lock(&i2s->irq_lock);
+ if (err && i2s->substream)
snd_pcm_stop_xrun(i2s->substream);
+ spin_unlock(&i2s->irq_lock);
return IRQ_HANDLED;
}
@@ -540,9 +544,12 @@ static int stm32_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
+ unsigned long flags;
int ret;
+ spin_lock_irqsave(&i2s->irq_lock, flags);
i2s->substream = substream;
+ spin_unlock_irqrestore(&i2s->irq_lock, flags);
ret = clk_prepare_enable(i2s->i2sclk);
if (ret < 0) {
@@ -673,13 +680,16 @@ static void stm32_i2s_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
-
- i2s->substream = NULL;
+ unsigned long flags;
regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
I2S_CGFR_MCKOE, (unsigned int)~I2S_CGFR_MCKOE);
clk_disable_unprepare(i2s->i2sclk);
+
+ spin_lock_irqsave(&i2s->irq_lock, flags);
+ i2s->substream = NULL;
+ spin_unlock_irqrestore(&i2s->irq_lock, flags);
}
static int stm32_i2s_dai_probe(struct snd_soc_dai *cpu_dai)
@@ -874,6 +884,7 @@ static int stm32_i2s_probe(struct platform_device *pdev)
i2s->pdev = pdev;
i2s->ms_flg = I2S_MS_NOT_SET;
spin_lock_init(&i2s->lock_fd);
+ spin_lock_init(&i2s->irq_lock);
platform_set_drvdata(pdev, i2s);
ret = stm32_i2s_dais_init(pdev, i2s);