ieee1394: unroll a weird macro

This is a coding style touch-up for ieee1394's handle_incoming_packet().

A preprocessor macro contained hardwired variable names and, even worse,
the 'break' keyword.  This macro is now unrolled and removed.

Also, all 'break's which had the effect of a return are replaced by
return.  And a FIXME comment is brought up to date.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 41 insertions, 50 deletions

diff --git a/drivers/ieee1394/ieee1394_core.c b/drivers/ieee1394/ieee1394_core.c
index d2240a4a1c2..b368958dc06 100644
--- a/drivers/ieee1394/ieee1394_core.c
+++ b/drivers/ieee1394/ieee1394_core.c
@@ -859,12 +859,9 @@ static void fill_async_lock_resp(struct hpsb_packet *packet, int rcode, int extc
         packet->data_size = length;
 }
 
-#define PREP_REPLY_PACKET(length) \
-                packet = create_reply_packet(host, data, length); \
-                if (packet == NULL) break
-
 static void handle_incoming_packet(struct hpsb_host *host, int tcode,
-                                   quadlet_t *data, size_t size, int write_acked)
+                                   quadlet_t *data, size_t size,
+                                   int write_acked)
 {
         struct hpsb_packet *packet;
         int length, rcode, extcode;
@@ -874,74 +871,72 @@ static void handle_incoming_packet(struct hpsb_host *host, int tcode,
         u16 flags = (u16) data[0];
         u64 addr;
 
-        /* big FIXME - no error checking is done for an out of bounds length */
+        /* FIXME?
+         * Out-of-bounds lengths are left for highlevel_read|write to cap. */
 
         switch (tcode) {
         case TCODE_WRITEQ:
                 addr = (((u64)(data[1] & 0xffff)) << 32) | data[2];
-                rcode = highlevel_write(host, source, dest, data+3,
+                rcode = highlevel_write(host, source, dest, data + 3,
                                         addr, 4, flags);
-
-                if (!write_acked
-                    && (NODEID_TO_NODE(data[0] >> 16) != NODE_MASK)
-                    && (rcode >= 0)) {
-                        /* not a broadcast write, reply */
-                        PREP_REPLY_PACKET(0);
-                        fill_async_write_resp(packet, rcode);
-                        send_packet_nocare(packet);
-                }
-                break;
+                goto handle_write_request;
 
         case TCODE_WRITEB:
                 addr = (((u64)(data[1] & 0xffff)) << 32) | data[2];
-                rcode = highlevel_write(host, source, dest, data+4,
-                                        addr, data[3]>>16, flags);
-
-                if (!write_acked
-                    && (NODEID_TO_NODE(data[0] >> 16) != NODE_MASK)
-                    && (rcode >= 0)) {
-                        /* not a broadcast write, reply */
-                        PREP_REPLY_PACKET(0);
+                rcode = highlevel_write(host, source, dest, data + 4,
+                                        addr, data[3] >> 16, flags);
+handle_write_request:
+                if (rcode < 0 || write_acked ||
+                    NODEID_TO_NODE(data[0] >> 16) == NODE_MASK)
+                        return;
+                /* not a broadcast write, reply */
+                packet = create_reply_packet(host, data, 0);
+                if (packet) {
                         fill_async_write_resp(packet, rcode);
                         send_packet_nocare(packet);
                 }
-                break;
+                return;
 
         case TCODE_READQ:
                 addr = (((u64)(data[1] & 0xffff)) << 32) | data[2];
                 rcode = highlevel_read(host, source, &buffer, addr, 4, flags);
+                if (rcode < 0)
+                        return;
 
-                if (rcode >= 0) {
-                        PREP_REPLY_PACKET(0);
+                packet = create_reply_packet(host, data, 0);
+                if (packet) {
                         fill_async_readquad_resp(packet, rcode, buffer);
                         send_packet_nocare(packet);
                 }
-                break;
+                return;
 
         case TCODE_READB:
                 length = data[3] >> 16;
-                PREP_REPLY_PACKET(length);
+                packet = create_reply_packet(host, data, length);
+                if (!packet)
+                        return;
 
                 addr = (((u64)(data[1] & 0xffff)) << 32) | data[2];
                 rcode = highlevel_read(host, source, packet->data, addr,
                                        length, flags);
-
-                if (rcode >= 0) {
-                        fill_async_readblock_resp(packet, rcode, length);
-                        send_packet_nocare(packet);
-                } else {
+                if (rcode < 0) {
                         hpsb_free_packet(packet);
+                        return;
                 }
-                break;
+                fill_async_readblock_resp(packet, rcode, length);
+                send_packet_nocare(packet);
+                return;
 
         case TCODE_LOCK_REQUEST:
                 length = data[3] >> 16;
                 extcode = data[3] & 0xffff;
                 addr = (((u64)(data[1] & 0xffff)) << 32) | data[2];
 
-                PREP_REPLY_PACKET(8);
+                packet = create_reply_packet(host, data, 8);
+                if (!packet)
+                        return;
 
-                if ((extcode == 0) || (extcode >= 7)) {
+                if (extcode == 0 || extcode >= 7) {
                         /* let switch default handle error */
                         length = 0;
                 }
@@ -949,12 +944,12 @@ static void handle_incoming_packet(struct hpsb_host *host, int tcode,
                 switch (length) {
                 case 4:
                         rcode = highlevel_lock(host, source, packet->data, addr,
-                                               data[4], 0, extcode,flags);
+                                               data[4], 0, extcode, flags);
                         fill_async_lock_resp(packet, rcode, extcode, 4);
                         break;
                 case 8:
-                        if ((extcode != EXTCODE_FETCH_ADD)
-                            && (extcode != EXTCODE_LITTLE_ADD)) {
+                        if (extcode != EXTCODE_FETCH_ADD &&
+                            extcode != EXTCODE_LITTLE_ADD) {
                                 rcode = highlevel_lock(host, source,
                                                        packet->data, addr,
                                                        data[5], data[4],
@@ -978,20 +973,16 @@ static void handle_incoming_packet(struct hpsb_host *host, int tcode,
                         break;
                 default:
                         rcode = RCODE_TYPE_ERROR;
-                        fill_async_lock_resp(packet, rcode,
-                                             extcode, 0);
+                        fill_async_lock_resp(packet, rcode, extcode, 0);
                 }
 
-                if (rcode >= 0) {
-                        send_packet_nocare(packet);
-                } else {
+                if (rcode < 0)
                         hpsb_free_packet(packet);
-                }
-                break;
+                else
+                        send_packet_nocare(packet);
+                return;
         }
-
 }
-#undef PREP_REPLY_PACKET
 
 /**
  * hpsb_packet_received - hand over received packet to the core