diff --git a/drivers/audio/es1370/es1370.c b/drivers/audio/es1370/es1370.c
index 1c3196d67..7f4679acd 100644
--- a/drivers/audio/es1370/es1370.c
+++ b/drivers/audio/es1370/es1370.c
@@ -353,11 +353,11 @@ int drv_set_dma(u32_t dma, u32_t length, int chan) {
 		case DAC1_CHAN: page = DAC_MEM_PAGE;
 						frame_count_reg = DAC1_BUFFER_SIZE;
 						dma_add_reg = DAC1_PCI_ADDRESS;
-						break;;
+						break;
 		case DAC2_CHAN: page = DAC_MEM_PAGE;
 						frame_count_reg = DAC2_BUFFER_SIZE;
 						dma_add_reg = DAC2_PCI_ADDRESS;
-						break;;    
+						break;    
 		default: return EIO;
 	}
 	pci_outb(reg(MEM_PAGE), page);
@@ -390,9 +390,10 @@ int drv_int(int sub_dev) {
 
 	/* return status of interrupt bit of specified channel*/
 	switch (sub_dev) {
-		case DAC1_CHAN:  bit = DAC1;break;
-		case DAC2_CHAN:  bit = DAC2;break;
-		case ADC1_CHAN:  bit = ADC;break;
+		case DAC1_CHAN:  bit = DAC1; break;
+		case DAC2_CHAN:  bit = DAC2; break;
+		case ADC1_CHAN:  bit = ADC; break;
+		default: return EINVAL;
 	}
 
 	int_status = pci_inl(reg(INTERRUPT_STATUS)) & bit;
@@ -408,7 +409,7 @@ int drv_reenable_int(int chan) {
 		case ADC1_CHAN: int_en_bit = R1_INT_EN; break;
 		case DAC1_CHAN: int_en_bit = P1_INTR_EN; break;
 		case DAC2_CHAN: int_en_bit = P2_INTR_EN; break;    
-		default: EINVAL;
+		default: return EINVAL;
 	}
 
 	/* clear and reenable an interrupt */
@@ -591,7 +592,7 @@ PRIVATE int disable_int(int chan) {
 		case ADC1_CHAN: int_en_bit = R1_INT_EN; break;
 		case DAC1_CHAN: int_en_bit = P1_INTR_EN; break;
 		case DAC2_CHAN: int_en_bit = P2_INTR_EN; break;    
-		default: EINVAL;
+		default: return EINVAL;
 	}
 	/* clear the interrupt */
 	ser_interface = pci_inw(reg(SERIAL_INTERFACE_CTRL));
diff --git a/drivers/audio/es1371/es1371.c b/drivers/audio/es1371/es1371.c
index be1715782..e91a09a8c 100644
--- a/drivers/audio/es1371/es1371.c
+++ b/drivers/audio/es1371/es1371.c
@@ -395,6 +395,7 @@ int drv_int(int sub_dev) {
 		case DAC1_CHAN:  bit = DAC1;break;
 		case DAC2_CHAN:  bit = DAC2;break;
 		case ADC1_CHAN:  bit = ADC;break;
+		default: return EINVAL;
 	}
 
 	int_status = pci_inl(reg(INTERRUPT_STATUS)) & bit;
@@ -410,7 +411,7 @@ int drv_reenable_int(int chan) {
 		case ADC1_CHAN: int_en_bit = R1_INT_EN; break;
 		case DAC1_CHAN: int_en_bit = P1_INTR_EN; break;
 		case DAC2_CHAN: int_en_bit = P2_INTR_EN; break;    
-		default: EINVAL;
+		default: return EINVAL;
 	}
 
 	/* clear and reenable an interrupt */
@@ -594,7 +595,7 @@ PRIVATE int disable_int(int chan) {
 		case ADC1_CHAN: int_en_bit = R1_INT_EN; break;
 		case DAC1_CHAN: int_en_bit = P1_INTR_EN; break;
 		case DAC2_CHAN: int_en_bit = P2_INTR_EN; break;    
-		default: EINVAL;
+		default: return EINVAL;
 	}
 	/* clear the interrupt */
 	ser_interface = pci_inw(reg(SERIAL_INTERFACE_CTRL));