mISDN: DSP now uses ring buffer for echo canceler

DSP now uses ring buffer for echo canceler.
Added missing include in l1oip_codec.c
Signed-off-by: NAndreas Eversberg <andreas@eversberg.eu>
Signed-off-by: NKarsten Keil <keil@b1-systems.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/isdn/mISDN/dsp.h

@@ -112,7 +112,8 @@ struct dsp_conf {
 
 #define DSP_DTMF_NPOINTS 102
 
-#define ECHOCAN_BUFLEN (4*128)
+#define ECHOCAN_BUFF_SIZE 0x400 /* must be 2**n */
+#define ECHOCAN_BUFF_MASK 0x3ff /* -1 */
 
 struct dsp_dtmf {
 	int		treshold; /* above this is dtmf (square of) */

drivers/isdn/mISDN/l1oip_codec.c

@@ -48,6 +48,7 @@ NOTE: The bytes are handled as they are law-encoded.
 
 #include <linux/vmalloc.h>
 #include <linux/mISDNif.h>
+#include <linux/in.h>
 #include "core.h"
 #include "l1oip.h"