diff --git a/include/sound/emu10k1.h b/include/sound/emu10k1.h
index 9cc10fab01a8..234b5baea69c 100644
--- a/include/sound/emu10k1.h
+++ b/include/sound/emu10k1.h
@@ -1685,6 +1685,7 @@ struct snd_emu1010 {
 	unsigned int optical_in; /* 0:SPDIF, 1:ADAT */
 	unsigned int optical_out; /* 0:SPDIF, 1:ADAT */
 	struct work_struct work;
+	struct mutex lock;
 };
 
 struct snd_emu10k1 {
@@ -1833,6 +1834,9 @@ unsigned int snd_emu10k1_ptr20_read(struct snd_emu10k1 * emu, unsigned int reg,
 void snd_emu10k1_ptr20_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned int chn, unsigned int data);
 int snd_emu10k1_spi_write(struct snd_emu10k1 * emu, unsigned int data);
 int snd_emu10k1_i2c_write(struct snd_emu10k1 *emu, u32 reg, u32 value);
+static inline void snd_emu1010_fpga_lock(struct snd_emu10k1 *emu) { mutex_lock(&emu->emu1010.lock); };
+static inline void snd_emu1010_fpga_unlock(struct snd_emu10k1 *emu) { mutex_unlock(&emu->emu1010.lock); };
+void snd_emu1010_fpga_write_lock(struct snd_emu10k1 *emu, u32 reg, u32 value);
 void snd_emu1010_fpga_write(struct snd_emu10k1 *emu, u32 reg, u32 value);
 void snd_emu1010_fpga_read(struct snd_emu10k1 *emu, u32 reg, u32 *value);
 void snd_emu1010_fpga_link_dst_src_write(struct snd_emu10k1 *emu, u32 dst, u32 src);
diff --git a/sound/pci/emu10k1/emu10k1_main.c b/sound/pci/emu10k1/emu10k1_main.c
index 86eaf5963502..1a2905e8672b 100644
--- a/sound/pci/emu10k1/emu10k1_main.c
+++ b/sound/pci/emu10k1/emu10k1_main.c
@@ -810,15 +810,19 @@ static void emu1010_work(struct work_struct *work)
 		return;
 #endif
 
+	snd_emu1010_fpga_lock(emu);
+
 	snd_emu1010_fpga_read(emu, EMU_HANA_IRQ_STATUS, &sts);
 
 	// The distinction of the IRQ status bits is unreliable,
 	// so we dispatch later based on option card status.
 	if (sts & (EMU_HANA_IRQ_DOCK | EMU_HANA_IRQ_DOCK_LOST))
 		emu1010_dock_event(emu);
 
 	if (sts & EMU_HANA_IRQ_WCLK_CHANGED)
 		emu1010_clock_event(emu);
+
+	snd_emu1010_fpga_unlock(emu);
 }
 
 static void emu1010_interrupt(struct snd_emu10k1 *emu)
@@ -852,6 +856,8 @@ static int snd_emu10k1_emu1010_init(struct snd_emu10k1 *emu)
 	 * Proper init follows in snd_emu10k1_init(). */
 	outl(HCFG_LOCKSOUNDCACHE | HCFG_LOCKTANKCACHE_MASK, emu->port + HCFG);
 
+	snd_emu1010_fpga_lock(emu);
+
 	/* Disable 48Volt power to Audio Dock */
 	snd_emu1010_fpga_write(emu, EMU_HANA_DOCK_PWR, 0);
 
@@ -877,17 +883,18 @@ static int snd_emu10k1_emu1010_init(struct snd_emu10k1 *emu)
 	err = snd_emu1010_load_firmware(emu, 0, &emu->firmware);
 	if (err < 0) {
 		dev_info(emu->card->dev, "emu1010: Loading Firmware failed\n");
-		return err;
+		goto fail;
 	}
 
 	/* ID, should read & 0x7f = 0x55 when FPGA programmed. */
 	snd_emu1010_fpga_read(emu, EMU_HANA_ID, &reg);
 	if ((reg & 0x3f) != 0x15) {
 		/* FPGA failed to be programmed */
 		dev_info(emu->card->dev,
 			 "emu1010: Loading Hana Firmware file failed, reg = 0x%x\n",
 			 reg);
-		return -ENODEV;
+		err = -ENODEV;
+		goto fail;
 	}
 
 	dev_info(emu->card->dev, "emu1010: Hana Firmware loaded\n");
@@ -947,7 +954,9 @@ static int snd_emu10k1_emu1010_init(struct snd_emu10k1 *emu)
 	// so it is safe to simply enable the outputs.
 	snd_emu1010_fpga_write(emu, EMU_HANA_UNMUTE, EMU_UNMUTE);
 
-	return 0;
+fail:
+	snd_emu1010_fpga_unlock(emu);
+	return err;
 }
 /*
  *  Create the EMU10K1 instance
@@ -969,9 +978,10 @@ static void snd_emu10k1_free(struct snd_card *card)
 	}
 	if (emu->card_capabilities->emu_model == EMU_MODEL_EMU1010) {
 		/* Disable 48Volt power to Audio Dock */
-		snd_emu1010_fpga_write(emu, EMU_HANA_DOCK_PWR, 0);
+		snd_emu1010_fpga_write_lock(emu, EMU_HANA_DOCK_PWR, 0);
 	}
 	cancel_work_sync(&emu->emu1010.work);
+	mutex_destroy(&emu->emu1010.lock);
 	release_firmware(emu->firmware);
 	release_firmware(emu->dock_fw);
 	snd_util_memhdr_free(emu->memhdr);
@@ -1551,6 +1561,7 @@ int snd_emu10k1_create(struct snd_card *card,
 	emu->synth = NULL;
 	emu->get_synth_voice = NULL;
 	INIT_WORK(&emu->emu1010.work, emu1010_work);
+	mutex_init(&emu->emu1010.lock);
 	/* read revision & serial */
 	emu->revision = pci->revision;
 	pci_read_config_dword(pci, PCI_SUBSYSTEM_VENDOR_ID, &emu->serial);
diff --git a/sound/pci/emu10k1/emumixer.c b/sound/pci/emu10k1/emumixer.c
index 0a32ea53d8c6..05b98d9b547b 100644
--- a/sound/pci/emu10k1/emumixer.c
+++ b/sound/pci/emu10k1/emumixer.c
@@ -661,7 +661,9 @@ static int snd_emu1010_output_source_put(struct snd_kcontrol *kcontrol,
 	change = (emu->emu1010.output_source[channel] != val);
 	if (change) {
 		emu->emu1010.output_source[channel] = val;
+		snd_emu1010_fpga_lock(emu);
 		snd_emu1010_output_source_apply(emu, channel, val);
+		snd_emu1010_fpga_unlock(emu);
 	}
 	return change;
 }
@@ -705,7 +707,9 @@ static int snd_emu1010_input_source_put(struct snd_kcontrol *kcontrol,
 	change = (emu->emu1010.input_source[channel] != val);
 	if (change) {
 		emu->emu1010.input_source[channel] = val;
+		snd_emu1010_fpga_lock(emu);
 		snd_emu1010_input_source_apply(emu, channel, val);
+		snd_emu1010_fpga_unlock(emu);
 	}
 	return change;
 }
@@ -774,7 +778,7 @@ static int snd_emu1010_adc_pads_put(struct snd_kcontrol *kcontrol, struct snd_ct
 		cache = cache & ~mask;
 	change = (cache != emu->emu1010.adc_pads);
 	if (change) {
-		snd_emu1010_fpga_write(emu, EMU_HANA_ADC_PADS, cache );
+		snd_emu1010_fpga_write_lock(emu, EMU_HANA_ADC_PADS, cache );
 	        emu->emu1010.adc_pads = cache;
 	}
 
@@ -832,7 +836,7 @@ static int snd_emu1010_dac_pads_put(struct snd_kcontrol *kcontrol, struct snd_ct
 		cache = cache & ~mask;
 	change = (cache != emu->emu1010.dac_pads);
 	if (change) {
-		snd_emu1010_fpga_write(emu, EMU_HANA_DAC_PADS, cache );
+		snd_emu1010_fpga_write_lock(emu, EMU_HANA_DAC_PADS, cache );
 	        emu->emu1010.dac_pads = cache;
 	}
 
@@ -980,6 +984,7 @@ static int snd_emu1010_clock_source_put(struct snd_kcontrol *kcontrol,
 	val = ucontrol->value.enumerated.item[0] ;
 	if (val >= emu_ci->num)
 		return -EINVAL;
+	snd_emu1010_fpga_lock(emu);
 	spin_lock_irq(&emu->reg_lock);
 	change = (emu->emu1010.clock_source != val);
 	if (change) {
@@ -996,6 +1001,7 @@ static int snd_emu1010_clock_source_put(struct snd_kcontrol *kcontrol,
 	} else {
 		spin_unlock_irq(&emu->reg_lock);
 	}
+	snd_emu1010_fpga_unlock(emu);
 	return change;
 }
 
@@ -1041,7 +1047,7 @@ static int snd_emu1010_clock_fallback_put(struct snd_kcontrol *kcontrol,
 	change = (emu->emu1010.clock_fallback != val);
 	if (change) {
 		emu->emu1010.clock_fallback = val;
-		snd_emu1010_fpga_write(emu, EMU_HANA_DEFCLOCK, 1 - val);
+		snd_emu1010_fpga_write_lock(emu, EMU_HANA_DEFCLOCK, 1 - val);
 	}
 	return change;
 }
@@ -1093,7 +1099,7 @@ static int snd_emu1010_optical_out_put(struct snd_kcontrol *kcontrol,
 		emu->emu1010.optical_out = val;
 		tmp = (emu->emu1010.optical_in ? EMU_HANA_OPTICAL_IN_ADAT : EMU_HANA_OPTICAL_IN_SPDIF) |
 			(emu->emu1010.optical_out ? EMU_HANA_OPTICAL_OUT_ADAT : EMU_HANA_OPTICAL_OUT_SPDIF);
-		snd_emu1010_fpga_write(emu, EMU_HANA_OPTICAL_TYPE, tmp);
+		snd_emu1010_fpga_write_lock(emu, EMU_HANA_OPTICAL_TYPE, tmp);
 	}
 	return change;
 }
@@ -1144,7 +1150,7 @@ static int snd_emu1010_optical_in_put(struct snd_kcontrol *kcontrol,
 		emu->emu1010.optical_in = val;
 		tmp = (emu->emu1010.optical_in ? EMU_HANA_OPTICAL_IN_ADAT : EMU_HANA_OPTICAL_IN_SPDIF) |
 			(emu->emu1010.optical_out ? EMU_HANA_OPTICAL_OUT_ADAT : EMU_HANA_OPTICAL_OUT_SPDIF);
-		snd_emu1010_fpga_write(emu, EMU_HANA_OPTICAL_TYPE, tmp);
+		snd_emu1010_fpga_write_lock(emu, EMU_HANA_OPTICAL_TYPE, tmp);
 	}
 	return change;
 }
@@ -2323,7 +2329,9 @@ int snd_emu10k1_mixer(struct snd_emu10k1 *emu,
 		for (i = 0; i < emu_ri->n_outs; i++)
 			emu->emu1010.output_source[i] =
 				emu1010_map_source(emu_ri, emu_ri->out_dflts[i]);
+		snd_emu1010_fpga_lock(emu);
 		snd_emu1010_apply_sources(emu);
+		snd_emu1010_fpga_unlock(emu);
 
 		kctl = emu->ctl_clock_source = snd_ctl_new1(&snd_emu1010_clock_source, emu);
 		err = snd_ctl_add(card, kctl);
diff --git a/sound/pci/emu10k1/emuproc.c b/sound/pci/emu10k1/emuproc.c
index 2f80fd91017c..737c28d31b41 100644
--- a/sound/pci/emu10k1/emuproc.c
+++ b/sound/pci/emu10k1/emuproc.c
@@ -165,6 +165,8 @@ static void snd_emu10k1_proc_spdif_read(struct snd_info_entry *entry,
 	u32 value2;
 
 	if (emu->card_capabilities->emu_model) {
+		snd_emu1010_fpga_lock(emu);
+
 		// This represents the S/PDIF lock status on 0404b, which is
 		// kinda weird and unhelpful, because monitoring it via IRQ is
 		// impractical (one gets an IRQ flood as long as it is desynced).
@@ -197,6 +199,8 @@ static void snd_emu10k1_proc_spdif_read(struct snd_info_entry *entry,
 			snd_iprintf(buffer, "\nS/PDIF mode: %s%s\n",
 				    value & EMU_HANA_SPDIF_MODE_RX_PRO ? "professional" : "consumer",
 				    value & EMU_HANA_SPDIF_MODE_RX_NOCOPY ? ", no copy" : "");
+
+		snd_emu1010_fpga_unlock(emu);
 	} else {
 		snd_emu10k1_proc_spdif_status(emu, buffer, "CD-ROM S/PDIF In", CDCS, CDSRCS);
 		snd_emu10k1_proc_spdif_status(emu, buffer, "Optical or Coax S/PDIF In", GPSCS, GPSRCS);
@@ -458,6 +462,9 @@ static void snd_emu_proc_emu1010_reg_read(struct snd_info_entry *entry,
 	struct snd_emu10k1 *emu = entry->private_data;
 	u32 value;
 	int i;
+
+	snd_emu1010_fpga_lock(emu);
+
 	snd_iprintf(buffer, "EMU1010 Registers:\n\n");
 
 	for(i = 0; i < 0x40; i+=1) {
@@ -496,6 +503,8 @@ static void snd_emu_proc_emu1010_reg_read(struct snd_info_entry *entry,
 			snd_emu_proc_emu1010_link_read(emu, buffer, 0x701);
 		}
 	}
+
+	snd_emu1010_fpga_unlock(emu);
 }
 
 static void snd_emu_proc_io_reg_read(struct snd_info_entry *entry,
diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c
index 74df2330015f..f3260a81e47b 100644
--- a/sound/pci/emu10k1/io.c
+++ b/sound/pci/emu10k1/io.c
@@ -289,71 +289,63 @@ static void snd_emu1010_fpga_write_locked(struct snd_emu10k1 *emu, u32 reg, u32
 
 void snd_emu1010_fpga_write(struct snd_emu10k1 *emu, u32 reg, u32 value)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&emu->emu_lock, flags);
+	if (snd_BUG_ON(!mutex_is_locked(&emu->emu1010.lock)))
+		return;
 	snd_emu1010_fpga_write_locked(emu, reg, value);
-	spin_unlock_irqrestore(&emu->emu_lock, flags);
 }
 
-static void snd_emu1010_fpga_read_locked(struct snd_emu10k1 *emu, u32 reg, u32 *value)
+void snd_emu1010_fpga_write_lock(struct snd_emu10k1 *emu, u32 reg, u32 value)
+{
+	snd_emu1010_fpga_lock(emu);
+	snd_emu1010_fpga_write_locked(emu, reg, value);
+	snd_emu1010_fpga_unlock(emu);
+}
+
+void snd_emu1010_fpga_read(struct snd_emu10k1 *emu, u32 reg, u32 *value)
 {
 	// The higest input pin is used as the designated interrupt trigger,
 	// so it needs to be masked out.
 	// But note that any other input pin change will also cause an IRQ,
 	// so using this function often causes an IRQ as a side effect.
 	u32 mask = emu->card_capabilities->ca0108_chip ? 0x1f : 0x7f;
+
+	if (snd_BUG_ON(!mutex_is_locked(&emu->emu1010.lock)))
+		return;
 	if (snd_BUG_ON(reg > 0x3f))
 		return;
 	reg += 0x40; /* 0x40 upwards are registers. */
 	outw(reg, emu->port + A_GPIO);
 	udelay(10);
 	outw(reg | 0x80, emu->port + A_GPIO);  /* High bit clocks the value into the fpga. */
 	udelay(10);
 	*value = ((inw(emu->port + A_GPIO) >> 8) & mask);
 }
 
-void snd_emu1010_fpga_read(struct snd_emu10k1 *emu, u32 reg, u32 *value)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&emu->emu_lock, flags);
-	snd_emu1010_fpga_read_locked(emu, reg, value);
-	spin_unlock_irqrestore(&emu->emu_lock, flags);
-}
-
 /* Each Destination has one and only one Source,
  * but one Source can feed any number of Destinations simultaneously.
  */
 void snd_emu1010_fpga_link_dst_src_write(struct snd_emu10k1 *emu, u32 dst, u32 src)
 {
-	unsigned long flags;
-
 	if (snd_BUG_ON(dst & ~0x71f))
 		return;
 	if (snd_BUG_ON(src & ~0x71f))
 		return;
-	spin_lock_irqsave(&emu->emu_lock, flags);
-	snd_emu1010_fpga_write_locked(emu, EMU_HANA_DESTHI, dst >> 8);
-	snd_emu1010_fpga_write_locked(emu, EMU_HANA_DESTLO, dst & 0x1f);
-	snd_emu1010_fpga_write_locked(emu, EMU_HANA_SRCHI, src >> 8);
-	snd_emu1010_fpga_write_locked(emu, EMU_HANA_SRCLO, src & 0x1f);
-	spin_unlock_irqrestore(&emu->emu_lock, flags);
+	snd_emu1010_fpga_write(emu, EMU_HANA_DESTHI, dst >> 8);
+	snd_emu1010_fpga_write(emu, EMU_HANA_DESTLO, dst & 0x1f);
+	snd_emu1010_fpga_write(emu, EMU_HANA_SRCHI, src >> 8);
+	snd_emu1010_fpga_write(emu, EMU_HANA_SRCLO, src & 0x1f);
 }
 
 u32 snd_emu1010_fpga_link_dst_src_read(struct snd_emu10k1 *emu, u32 dst)
 {
-	unsigned long flags;
 	u32 hi, lo;
 
 	if (snd_BUG_ON(dst & ~0x71f))
 		return 0;
-	spin_lock_irqsave(&emu->emu_lock, flags);
-	snd_emu1010_fpga_write_locked(emu, EMU_HANA_DESTHI, dst >> 8);
-	snd_emu1010_fpga_write_locked(emu, EMU_HANA_DESTLO, dst & 0x1f);
-	snd_emu1010_fpga_read_locked(emu, EMU_HANA_SRCHI, &hi);
-	snd_emu1010_fpga_read_locked(emu, EMU_HANA_SRCLO, &lo);
-	spin_unlock_irqrestore(&emu->emu_lock, flags);
+	snd_emu1010_fpga_write(emu, EMU_HANA_DESTHI, dst >> 8);
+	snd_emu1010_fpga_write(emu, EMU_HANA_DESTLO, dst & 0x1f);
+	snd_emu1010_fpga_read(emu, EMU_HANA_SRCHI, &hi);
+	snd_emu1010_fpga_read(emu, EMU_HANA_SRCLO, &lo);
 	return (hi << 8) | lo;
 }
 
