[DCCP] ccid3: Replace scaled division operations

This replaces the remaining uses of usecs_div with scaled_div32, which
internally uses 64bit division and produces a warning on overflow.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

1 files changed, 3 insertions, 24 deletions

diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index aa355d4cfc8a..bdd13de4f422 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -41,27 +41,6 @@
 #include "lib/tfrc.h"
 #include "ccid3.h"
 
-/*
- * Reason for maths here is to avoid 32 bit overflow when a is big.
- * With this we get close to the limit.
- */
-static u32 usecs_div(const u32 a, const u32 b)
-{
-        const u32 div = a < (UINT_MAX / (USEC_PER_SEC /    10)) ?    10 :
-                        a < (UINT_MAX / (USEC_PER_SEC /    50)) ?    50 :
-                        a < (UINT_MAX / (USEC_PER_SEC /   100)) ?   100 :
-                        a < (UINT_MAX / (USEC_PER_SEC /   500)) ?   500 :
-                        a < (UINT_MAX / (USEC_PER_SEC /  1000)) ?  1000 :
-                        a < (UINT_MAX / (USEC_PER_SEC /  5000)) ?  5000 :
-                        a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 :
-                        a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 :
-                                                                 100000;
-        const u32 tmp = a * (USEC_PER_SEC / div);
-        return (b >= 2 * div) ? tmp / (b / div) : tmp;
-}
-
-
-
 #ifdef CONFIG_IP_DCCP_CCID3_DEBUG
 static int ccid3_debug;
 #define ccid3_pr_debug(format, a...)    DCCP_PR_DEBUG(ccid3_debug, format, ##a)
@@ -731,8 +710,8 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
         case TFRC_RSTATE_DATA: {
                 const u32 delta = timeval_delta(&now,
                                         &hcrx->ccid3hcrx_tstamp_last_feedback);
-                hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
-                                                   delta);
+                hcrx->ccid3hcrx_x_recv =
+                        scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta);
         }
                 break;
         case TFRC_RSTATE_TERM:
@@ -862,7 +841,7 @@ found:
 
         dccp_timestamp(sk, &tstamp);
         delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
-        x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
+        x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta);
 
         if (x_recv == 0)
                 x_recv = hcrx->ccid3hcrx_x_recv;