bnx2: Add "fall through" comments

to indicate that the mising break statements are intended.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index 9b69a62..e6116ec 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -1972,22 +1972,26 @@
 		switch (speed) {
 			case BNX2_LINK_STATUS_10HALF:
 				bp->duplex = DUPLEX_HALF;
+				/* fall through */
 			case BNX2_LINK_STATUS_10FULL:
 				bp->line_speed = SPEED_10;
 				break;
 			case BNX2_LINK_STATUS_100HALF:
 				bp->duplex = DUPLEX_HALF;
+				/* fall through */
 			case BNX2_LINK_STATUS_100BASE_T4:
 			case BNX2_LINK_STATUS_100FULL:
 				bp->line_speed = SPEED_100;
 				break;
 			case BNX2_LINK_STATUS_1000HALF:
 				bp->duplex = DUPLEX_HALF;
+				/* fall through */
 			case BNX2_LINK_STATUS_1000FULL:
 				bp->line_speed = SPEED_1000;
 				break;
 			case BNX2_LINK_STATUS_2500HALF:
 				bp->duplex = DUPLEX_HALF;
+				/* fall through */
 			case BNX2_LINK_STATUS_2500FULL:
 				bp->line_speed = SPEED_2500;
 				break;