diff --git a/sound/sh/aica.c b/sound/sh/aica.c
index 131ec48..88dc840 100644
--- a/sound/sh/aica.c
+++ b/sound/sh/aica.c
@@ -106,11 +106,14 @@
 static void spu_memset(u32 toi, u32 what, int length)
 {
 	int i;
+	unsigned long flags;
 	snd_assert(length % 4 == 0, return);
 	for (i = 0; i < length; i++) {
 		if (!(i % 8))
 			spu_write_wait();
+		local_irq_save(flags);
 		writel(what, toi + SPU_MEMORY_BASE);
+		local_irq_restore(flags);
 		toi++;
 	}
 }
@@ -118,6 +121,7 @@
 /* spu_memload - write to SPU address space */
 static void spu_memload(u32 toi, void *from, int length)
 {
+	unsigned long flags;
 	u32 *froml = from;
 	u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
 	int i;
@@ -128,7 +132,9 @@
 		if (!(i % 8))
 			spu_write_wait();
 		val = *froml;
+		local_irq_save(flags);
 		writel(val, to);
+		local_irq_restore(flags);
 		froml++;
 		to++;
 	}
@@ -138,28 +144,36 @@
 static void spu_disable(void)
 {
 	int i;
+	unsigned long flags;
 	u32 regval;
 	spu_write_wait();
 	regval = readl(ARM_RESET_REGISTER);
 	regval |= 1;
 	spu_write_wait();
+	local_irq_save(flags);
 	writel(regval, ARM_RESET_REGISTER);
+	local_irq_restore(flags);
 	for (i = 0; i < 64; i++) {
 		spu_write_wait();
 		regval = readl(SPU_REGISTER_BASE + (i * 0x80));
 		regval = (regval & ~0x4000) | 0x8000;
 		spu_write_wait();
+		local_irq_save(flags);
 		writel(regval, SPU_REGISTER_BASE + (i * 0x80));
+		local_irq_restore(flags);
 	}
 }
 
 /* spu_enable - set spu registers to enable sound output */
 static void spu_enable(void)
 {
+	unsigned long flags;
 	u32 regval = readl(ARM_RESET_REGISTER);
 	regval &= ~1;
 	spu_write_wait();
+	local_irq_save(flags);
 	writel(regval, ARM_RESET_REGISTER);
+	local_irq_restore(flags);
 }
 
 /* 
@@ -168,25 +182,34 @@
 */
 static void spu_reset(void)
 {
+	unsigned long flags;
 	spu_disable();
 	spu_memset(0, 0, 0x200000 / 4);
 	/* Put ARM7 in endless loop */
+	local_irq_save(flags);
 	ctrl_outl(0xea000002, SPU_MEMORY_BASE);
+	local_irq_restore(flags);
 	spu_enable();
 }
 
 /* aica_chn_start - write to spu to start playback */
 static void aica_chn_start(void)
 {
+	unsigned long flags;
 	spu_write_wait();
+	local_irq_save(flags);
 	writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
+	local_irq_restore(flags);
 }
 
 /* aica_chn_halt - write to spu to halt playback */
 static void aica_chn_halt(void)
 {
+	unsigned long flags;
 	spu_write_wait();
+	local_irq_save(flags);
 	writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
+	local_irq_restore(flags);
 }
 
 /* ALSA code below */
@@ -213,12 +236,13 @@
 	int q, err, period_offset;
 	struct snd_card_aica *dreamcastcard;
 	struct snd_pcm_runtime *runtime;
-	err = 0;
+	unsigned long flags;
 	dreamcastcard = substream->pcm->private_data;
 	period_offset = dreamcastcard->clicks;
 	period_offset %= (AICA_PERIOD_NUMBER / channels);
 	runtime = substream->runtime;
 	for (q = 0; q < channels; q++) {
+		local_irq_save(flags);
 		err = dma_xfer(AICA_DMA_CHANNEL,
 			       (unsigned long) (runtime->dma_area +
 						(AICA_BUFFER_SIZE * q) /
@@ -228,9 +252,12 @@
 			       AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
 			       AICA_PERIOD_SIZE * period_offset,
 			       buffer_size / channels, AICA_DMA_MODE);
-		if (unlikely(err < 0))
+		if (unlikely(err < 0)) {
+			local_irq_restore(flags);
 			break;
+		}
 		dma_wait_for_completion(AICA_DMA_CHANNEL);
+		local_irq_restore(flags);
 	}
 	return err;
 }