diff --git a/sound/isa/opti9xx/opti92x-ad1848.c b/sound/isa/opti9xx/opti92x-ad1848.c
index 505cd81e19fa..ac0ab6eb40f0 100644
--- a/sound/isa/opti9xx/opti92x-ad1848.c
+++ b/sound/isa/opti9xx/opti92x-ad1848.c
@@ -261,6 +261,7 @@ static unsigned char snd_opti9xx_read(struct snd_opti9xx *chip,
 			retval = inb(chip->mc_base + 9);
 			break;
 		}
+		/* Fall through */
 
 	case OPTi9XX_HW_82C928:
 	case OPTi9XX_HW_82C929:
@@ -303,6 +304,7 @@ static void snd_opti9xx_write(struct snd_opti9xx *chip, unsigned char reg,
 			outb(value, chip->mc_base + 9);
 			break;
 		}
+		/* Fall through */
 
 	case OPTi9XX_HW_82C928:
 	case OPTi9XX_HW_82C929:
@@ -350,6 +352,7 @@ static int snd_opti9xx_configure(struct snd_opti9xx *chip,
 		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(4), 0xf0, 0xfc);
 		/* enable wave audio */
 		snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(6), 0x02, 0x02);
+		/* Fall through */
 
 	case OPTi9XX_HW_82C925:
 		/* enable WSS mode */