It seems this driver hasn't been updated for SMP, as local_irq_save/ local_irq_restore don't provide proper protection of read/modify/write of the device's registers on such systems. Introduce a spinlock serializing access to the register region, it will be helpful later when I2SMOD, I2SPSR registers are made also accessible through the clk API.
Signed-off-by: Sylwester Nawrocki s.nawrocki@samsung.com --- sound/soc/samsung/i2s.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c index 2bac719..20cc51f 100644 --- a/sound/soc/samsung/i2s.c +++ b/sound/soc/samsung/i2s.c @@ -94,6 +94,10 @@ struct i2s_dai { u32 suspend_i2scon; u32 suspend_i2spsr; const struct samsung_i2s_variant_regs *variant_regs; + + /* Spinlock protecting access to the device's registers */ + spinlock_t spinlock; + spinlock_t *lock; };
/* Lock for cross i/f checks */ @@ -867,10 +871,10 @@ static int i2s_trigger(struct snd_pcm_substream *substream, case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - local_irq_save(flags); + spin_lock_irqsave(i2s->lock, flags);
if (config_setup(i2s)) { - local_irq_restore(flags); + spin_unlock_irqrestore(i2s->lock, flags); return -EINVAL; }
@@ -879,12 +883,12 @@ static int i2s_trigger(struct snd_pcm_substream *substream, else i2s_txctrl(i2s, 1);
- local_irq_restore(flags); + spin_unlock_irqrestore(i2s->lock, flags); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - local_irq_save(flags); + spin_lock_irqsave(i2s->lock, flags);
if (capture) { i2s_rxctrl(i2s, 0); @@ -894,7 +898,7 @@ static int i2s_trigger(struct snd_pcm_substream *substream, i2s_fifo(i2s, FIC_TXFLUSH); }
- local_irq_restore(flags); + spin_unlock_irqrestore(i2s->lock, flags); break; }
@@ -1157,6 +1161,9 @@ static int samsung_i2s_probe(struct platform_device *pdev) return -ENOMEM; }
+ spin_lock_init(&pri_dai->spinlock); + pri_dai->lock = &pri_dai->spinlock; + if (!np) { res = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!res) { @@ -1234,6 +1241,7 @@ static int samsung_i2s_probe(struct platform_device *pdev) return -ENOMEM; }
+ sec_dai->lock = &pri_dai->spinlock; sec_dai->variant_regs = pri_dai->variant_regs; sec_dai->dma_playback.dma_addr = regs_base + I2STXDS; sec_dai->dma_playback.ch_name = "tx-sec";