linux-kernel - [PATCH] net: plip: mark expected switch fall-throughs

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Date:   Fri, 3 Nov 2017 09:31:53 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     netdev@...r.kernel.org
Cc:     David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] net: plip: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

Addresses-Coverity-ID: 114893
Addresses-Coverity-ID: 114894
Addresses-Coverity-ID: 114895
Addresses-Coverity-ID: 114896
Addresses-Coverity-ID: 114897
Addresses-Coverity-ID: 114898
Addresses-Coverity-ID: 114899
Addresses-Coverity-ID: 114900
Addresses-Coverity-ID: 114901
Addresses-Coverity-ID: 114902
Addresses-Coverity-ID: 114903
Addresses-Coverity-ID: 114904
Addresses-Coverity-ID: 114905
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/net/plip/plip.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/plip/plip.c b/drivers/net/plip/plip.c
index 3c55ea3..feb92ec 100644
--- a/drivers/net/plip/plip.c
+++ b/drivers/net/plip/plip.c
@@ -502,6 +502,7 @@ plip_receive(unsigned short nibble_timeout, struct net_device *dev,
 		*data_p = (c0 >> 3) & 0x0f;
 		write_data (dev, 0x10); /* send ACK */
 		*ns_p = PLIP_NB_1;
+		/* fall through */
 
 	case PLIP_NB_1:
 		cx = nibble_timeout;
@@ -597,6 +598,7 @@ plip_receive_packet(struct net_device *dev, struct net_local *nl,
 			printk(KERN_DEBUG "%s: receive start\n", dev->name);
 		rcv->state = PLIP_PK_LENGTH_LSB;
 		rcv->nibble = PLIP_NB_BEGIN;
+		/* fall through */
 
 	case PLIP_PK_LENGTH_LSB:
 		if (snd->state != PLIP_PK_DONE) {
@@ -617,6 +619,7 @@ plip_receive_packet(struct net_device *dev, struct net_local *nl,
 				return TIMEOUT;
 		}
 		rcv->state = PLIP_PK_LENGTH_MSB;
+		/* fall through */
 
 	case PLIP_PK_LENGTH_MSB:
 		if (plip_receive(nibble_timeout, dev,
@@ -639,6 +642,7 @@ plip_receive_packet(struct net_device *dev, struct net_local *nl,
 		rcv->state = PLIP_PK_DATA;
 		rcv->byte = 0;
 		rcv->checksum = 0;
+		/* fall through */
 
 	case PLIP_PK_DATA:
 		lbuf = rcv->skb->data;
@@ -651,6 +655,7 @@ plip_receive_packet(struct net_device *dev, struct net_local *nl,
 			rcv->checksum += lbuf[--rcv->byte];
 		} while (rcv->byte);
 		rcv->state = PLIP_PK_CHECKSUM;
+		/* fall through */
 
 	case PLIP_PK_CHECKSUM:
 		if (plip_receive(nibble_timeout, dev,
@@ -663,6 +668,7 @@ plip_receive_packet(struct net_device *dev, struct net_local *nl,
 			return ERROR;
 		}
 		rcv->state = PLIP_PK_DONE;
+		/* fall through */
 
 	case PLIP_PK_DONE:
 		/* Inform the upper layer for the arrival of a packet. */
@@ -708,6 +714,7 @@ plip_send(unsigned short nibble_timeout, struct net_device *dev,
 	case PLIP_NB_BEGIN:
 		write_data (dev, data & 0x0f);
 		*ns_p = PLIP_NB_1;
+		/* fall through */
 
 	case PLIP_NB_1:
 		write_data (dev, 0x10 | (data & 0x0f));
@@ -722,6 +729,7 @@ plip_send(unsigned short nibble_timeout, struct net_device *dev,
 		}
 		write_data (dev, 0x10 | (data >> 4));
 		*ns_p = PLIP_NB_2;
+		/* fall through */
 
 	case PLIP_NB_2:
 		write_data (dev, (data >> 4));
@@ -810,6 +818,7 @@ plip_send_packet(struct net_device *dev, struct net_local *nl,
 			      &snd->nibble, snd->length.b.lsb))
 			return TIMEOUT;
 		snd->state = PLIP_PK_LENGTH_MSB;
+		/* fall through */
 
 	case PLIP_PK_LENGTH_MSB:
 		if (plip_send(nibble_timeout, dev,
@@ -818,6 +827,7 @@ plip_send_packet(struct net_device *dev, struct net_local *nl,
 		snd->state = PLIP_PK_DATA;
 		snd->byte = 0;
 		snd->checksum = 0;
+		/* fall through */
 
 	case PLIP_PK_DATA:
 		do {
@@ -829,6 +839,7 @@ plip_send_packet(struct net_device *dev, struct net_local *nl,
 			snd->checksum += lbuf[--snd->byte];
 		} while (snd->byte);
 		snd->state = PLIP_PK_CHECKSUM;
+		/* fall through */
 
 	case PLIP_PK_CHECKSUM:
 		if (plip_send(nibble_timeout, dev,
@@ -839,6 +850,7 @@ plip_send_packet(struct net_device *dev, struct net_local *nl,
 		dev_kfree_skb(snd->skb);
 		dev->stats.tx_packets++;
 		snd->state = PLIP_PK_DONE;
+		/* fall through */
 
 	case PLIP_PK_DONE:
 		/* Close the connection */
@@ -927,6 +939,7 @@ plip_interrupt(void *dev_id)
 	switch (nl->connection) {
 	case PLIP_CN_CLOSING:
 		netif_wake_queue (dev);
+		/* fall through */
 	case PLIP_CN_NONE:
 	case PLIP_CN_SEND:
 		rcv->state = PLIP_PK_TRIGGER;
-- 
2.7.4