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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-06-11 12:19:10 +0200
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2008-06-11 12:19:10 +0200
commit7deb0f851003287d7e259bf6b33548b144c0f2d5 (patch)
tree8ede694c4b6cd41224f7165d09d3f5935d889fd1 /net
parentdccp ccid-3: TFRC reverse-lookup Bug-Fix (diff)
downloadlinux-7deb0f851003287d7e259bf6b33548b144c0f2d5.tar.xz
linux-7deb0f851003287d7e259bf6b33548b144c0f2d5.zip
dccp ccid-3: X truncated due to type conversion
This fixes a bug in computing the inter-packet-interval t_ipi = s/X: scaled_div32(a, b) uses u32 for b, but in "scaled_div32(s, X)" the type of the sending rate `X' is u64. Since X is scaled by 2^6, this truncates rates greater than 2^26 Bps (~537 Mbps). Using full 64-bit division now. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/ccids/lib/tfrc.h14
1 files changed, 6 insertions, 8 deletions
diff --git a/net/dccp/ccids/lib/tfrc.h b/net/dccp/ccids/lib/tfrc.h
index ddd8107b927f..ed9857527acf 100644
--- a/net/dccp/ccids/lib/tfrc.h
+++ b/net/dccp/ccids/lib/tfrc.h
@@ -15,7 +15,7 @@
* (at your option) any later version.
*/
#include <linux/types.h>
-#include <asm/div64.h>
+#include <linux/math64.h>
#include "../../dccp.h"
/* internal includes that this module exports: */
#include "loss_interval.h"
@@ -29,21 +29,19 @@ extern int tfrc_debug;
#endif
/* integer-arithmetic divisions of type (a * 1000000)/b */
-static inline u64 scaled_div(u64 a, u32 b)
+static inline u64 scaled_div(u64 a, u64 b)
{
BUG_ON(b==0);
- a *= 1000000;
- do_div(a, b);
- return a;
+ return div64_u64(a * 1000000, b);
}
-static inline u32 scaled_div32(u64 a, u32 b)
+static inline u32 scaled_div32(u64 a, u64 b)
{
u64 result = scaled_div(a, b);
if (result > UINT_MAX) {
- DCCP_CRIT("Overflow: a(%llu)/b(%u) > ~0U",
- (unsigned long long)a, b);
+ DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX",
+ (unsigned long long)a, (unsigned long long)b);
return UINT_MAX;
}
return result;