[media] dvb: earth-pt1: add an error check/report on the incoming data
This patch adds a data integrity check using the sequence counter and
error flags added by the bridge chip.
Signed-off-by: Akihiro Tsukada <tskd2@yahoo.co.jp>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/pt1/pt1.c b/drivers/media/dvb/pt1/pt1.c
index 463f784..8229a91 100644
--- a/drivers/media/dvb/pt1/pt1.c
+++ b/drivers/media/dvb/pt1/pt1.c
@@ -28,6 +28,7 @@
#include <linux/pci.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
+#include <linux/ratelimit.h>
#include "dvbdev.h"
#include "dvb_demux.h"
@@ -92,6 +93,7 @@
u8 *buf;
int upacket_count;
int packet_count;
+ int st_count;
struct dvb_adapter adap;
struct dvb_demux demux;
@@ -266,6 +268,7 @@
struct pt1_adapter *adap;
int offset;
u8 *buf;
+ int sc;
if (!page->upackets[PT1_NR_UPACKETS - 1])
return 0;
@@ -282,6 +285,16 @@
else if (!adap->upacket_count)
continue;
+ if (upacket >> 24 & 1)
+ printk_ratelimited(KERN_INFO "earth-pt1: device "
+ "buffer overflowing. table[%d] buf[%d]\n",
+ pt1->table_index, pt1->buf_index);
+ sc = upacket >> 26 & 0x7;
+ if (adap->st_count != -1 && sc != ((adap->st_count + 1) & 0x7))
+ printk_ratelimited(KERN_INFO "earth-pt1: data loss"
+ " in streamID(adapter)[%d]\n", index);
+ adap->st_count = sc;
+
buf = adap->buf;
offset = adap->packet_count * 188 + adap->upacket_count * 3;
buf[offset] = upacket >> 16;
@@ -652,6 +665,7 @@
adap->buf = buf;
adap->upacket_count = 0;
adap->packet_count = 0;
+ adap->st_count = -1;
dvb_adap = &adap->adap;
dvb_adap->priv = adap;