From bc7712bb01e71d41013f0b642740832819849d30 Mon Sep 17 00:00:00 2001
From: Michael Hunold <devnull@localhost>
Date: Sat, 28 Dec 2002 17:11:51 +0000
Subject: Added fix for fidbirq() related crashes for budget cards: simply
 ignore obviously bogus dmapos values.

---
 linux/drivers/media/dvb/av7110/av7110.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'linux/drivers/media/dvb/av7110/av7110.c')

diff --git a/linux/drivers/media/dvb/av7110/av7110.c b/linux/drivers/media/dvb/av7110/av7110.c
index 40d6e1abf..f0c75b5e5 100644
--- a/linux/drivers/media/dvb/av7110/av7110.c
+++ b/linux/drivers/media/dvb/av7110/av7110.c
@@ -731,6 +731,8 @@ TTBStop(av7110_t *av7110)
 
 #define TS_WIDTH  (4*188)
 #define TS_HEIGHT (1024/4)
+#define TS_BUFLEN (TS_WIDTH*TS_HEIGHT)
+
 static int
 TTBStart(av7110_t *av7110)
 {
@@ -970,6 +972,11 @@ void fidbirq (unsigned long data)
         dmapos=saa7146_read(av7110->dev, PCI_VDP3);
         dmapos-=(dmapos%188);
 
+	if (dmapos>=TS_BUFLEN) {
+		DEB_S(("bogus dmapos value ignored, av7110: %p\n",av7110));
+		return;
+	}
+
         if (av7110->tsf) {
                 mem+=av7110->ttbp;
                 if (dmapos<0x20000) {
-- 
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