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Commit 69881110 authored by Akihiro Tsukada's avatar Akihiro Tsukada Committed by Mauro Carvalho Chehab
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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: default avatarAkihiro Tsukada <tskd2@yahoo.co.jp>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 847e8765

drivers/media/dvb/pt1/pt1.c

+14 −0
Original line number Diff line number Diff line
@@ -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;