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[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>
This commit is contained in:
Akihiro Tsukada 2012-03-10 11:38:14 -03:00 committed by Mauro Carvalho Chehab
parent 847e876596
commit 6988111098
1 changed files with 14 additions and 0 deletions
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14
drivers/media/dvb/pt1/pt1.c
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@ -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 @@ struct pt1_adapter {
u8 *buf;
int upacket_count;
int packet_count;
int st_count;
struct dvb_adapter adap;
struct dvb_demux demux;
@ -266,6 +268,7 @@ static int pt1_filter(struct pt1 *pt1, struct pt1_buffer_page *page)
struct pt1_adapter *adap;
int offset;
u8 *buf;
int sc;
if (!page->upackets[PT1_NR_UPACKETS - 1])
return 0;
@ -282,6 +285,16 @@ static int pt1_filter(struct pt1 *pt1, struct pt1_buffer_page *page)
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 @@ pt1_alloc_adapter(struct pt1 *pt1)
adap->buf = buf;
adap->upacket_count = 0;
adap->packet_count = 0;
adap->st_count = -1;
dvb_adap = &adap->adap;
dvb_adap->priv = adap;