diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index 9335849..d539bee 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -200,10 +200,15 @@ static int qlogicpti_mbox_command(struct qlogicpti *qpti, u_short param[], int f
 	/* Write mailbox command registers. */
 	switch (mbox_param[param[0]] >> 4) {
 	case 6: sbus_writew(param[5], qpti->qregs + MBOX5);
+		/* Fall through */
 	case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
+		/* Fall through */
 	case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
+		/* Fall through */
 	case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
+		/* Fall through */
 	case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
+		/* Fall through */
 	case 1: sbus_writew(param[0], qpti->qregs + MBOX0);
 	}
 
@@ -254,10 +259,15 @@ static int qlogicpti_mbox_command(struct qlogicpti *qpti, u_short param[], int f
 	/* Read back output parameters. */
 	switch (mbox_param[param[0]] & 0xf) {
 	case 6: param[5] = sbus_readw(qpti->qregs + MBOX5);
+		/* Fall through */
 	case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
+		/* Fall through */
 	case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
+		/* Fall through */
 	case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
+		/* Fall through */
 	case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
+		/* Fall through */
 	case 1: param[0] = sbus_readw(qpti->qregs + MBOX0);
 	}