[DCCP]: Introduce DCCP_{BUG{_ON},CRIT} macros, use enum:8 for the ccid3 states

This patch tackles the following problem:
       * the ccid3_hc_{t,r}x_sock define ccid3hc{t,r}x_state as `u8', but
         in reality there can only be a few, pre-defined enum names
       * this necessitates addiditional checking for unexpected values
         which would otherwise be caught by the compiler

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 0a2cb7536d26..c122e757eb7f 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -73,6 +73,14 @@ struct ccid3_options_received {
         u32 ccid3or_receive_rate;
 };
 
+/* TFRC sender states */
+enum ccid3_hc_tx_states {
+        TFRC_SSTATE_NO_SENT = 1,
+        TFRC_SSTATE_NO_FBACK,
+        TFRC_SSTATE_FBACK,
+        TFRC_SSTATE_TERM,
+};
+
 /** struct ccid3_hc_tx_sock - CCID3 sender half connection sock
  *
   * @ccid3hctx_state - Sender state
@@ -103,7 +111,7 @@ struct ccid3_hc_tx_sock {
 #define ccid3hctx_t_rto                 ccid3hctx_tfrc.tfrctx_rto
 #define ccid3hctx_t_ipi                 ccid3hctx_tfrc.tfrctx_ipi
         u16                             ccid3hctx_s;
-        u8                              ccid3hctx_state;
+        enum ccid3_hc_tx_states         ccid3hctx_state:8;
         u8                              ccid3hctx_last_win_count;
         u8                              ccid3hctx_idle;
         struct timeval                  ccid3hctx_t_last_win_count;
@@ -115,6 +123,13 @@ struct ccid3_hc_tx_sock {
         struct ccid3_options_received   ccid3hctx_options_received;
 };
 
+/* TFRC receiver states */
+enum ccid3_hc_rx_states {
+        TFRC_RSTATE_NO_DATA = 1,
+        TFRC_RSTATE_DATA,
+        TFRC_RSTATE_TERM    = 127,
+};
+
 struct ccid3_hc_rx_sock {
         struct tfrc_rx_info     ccid3hcrx_tfrc;
 #define ccid3hcrx_x_recv        ccid3hcrx_tfrc.tfrcrx_x_recv
@@ -122,8 +137,8 @@ struct ccid3_hc_rx_sock {
 #define ccid3hcrx_p             ccid3hcrx_tfrc.tfrcrx_p
         u64                     ccid3hcrx_seqno_nonloss:48,
                                 ccid3hcrx_ccval_nonloss:4,
-                                ccid3hcrx_state:8,
                                 ccid3hcrx_ccval_last_counter:4;
+        enum ccid3_hc_rx_states ccid3hcrx_state:8;
         u32                     ccid3hcrx_bytes_recv;
         struct timeval          ccid3hcrx_tstamp_last_feedback;
         struct timeval          ccid3hcrx_tstamp_last_ack;