diff --git a/sound/drivers/mpu401/mpu401_uart.c b/sound/drivers/mpu401/mpu401_uart.c
index 3306ecd4924..b57f2d5a1c9 100644
--- a/sound/drivers/mpu401/mpu401_uart.c
+++ b/sound/drivers/mpu401/mpu401_uart.c
@@ -97,23 +97,27 @@ static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
 
 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
 {
+	unsigned long flags;
+
 	if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
 	    test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
-		spin_lock(&mpu->output_lock);
+		spin_lock_irqsave(&mpu->output_lock, flags);
 		snd_mpu401_uart_output_write(mpu);
-		spin_unlock(&mpu->output_lock);
+		spin_unlock_irqrestore(&mpu->output_lock, flags);
 	}
 }
 
 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
 {
+	unsigned long flags;
+
 	if (mpu->info_flags & MPU401_INFO_INPUT) {
-		spin_lock(&mpu->input_lock);
+		spin_lock_irqsave(&mpu->input_lock, flags);
 		if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
 			snd_mpu401_uart_input_read(mpu);
 		else
 			snd_mpu401_uart_clear_rx(mpu);
-		spin_unlock(&mpu->input_lock);
+		spin_unlock_irqrestore(&mpu->input_lock, flags);
 	}
 	if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
 		/* ok. for better Tx performance try do some output