[<prev] [next>] [day] [month] [year] [list]
Message-ID: <20250401041141.2016-1-vulab@iscas.ac.cn>
Date: Tue, 1 Apr 2025 12:11:41 +0800
From: Wentao Liang <vulab@...as.ac.cn>
To: mchehab@...nel.org
Cc: yujiaoliang@...o.com,
hverkuil@...all.nl,
linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org,
Wentao Liang <vulab@...as.ac.cn>,
stable@...r.kernel.org
Subject: [PATCH] media: dvb: Add error checking for bcm3510_writeB()
In bcm3510_bert_reset(), the function performed multiple writes
without checking the return value of bcm3510_writeB(). This could
result in silent failures if the writes failed, leaving the BER
counter in an undefined state.
Add error checking for each bcm3510_writeB call and propagate any
errors immediately. This ensures proper error handling and prevents
silent failures during BER counter initialization.
Fixes: 55f51efdb696 ("[PATCH] dvb: flexcop: add BCM3510 ATSC frontend support for Air2PC card")
Cc: stable@...r.kernel.org
Signed-off-by: Wentao Liang <vulab@...as.ac.cn>
---
drivers/media/dvb-frontends/bcm3510.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/media/dvb-frontends/bcm3510.c b/drivers/media/dvb-frontends/bcm3510.c
index d935fb10e620..fc5853fc9595 100644
--- a/drivers/media/dvb-frontends/bcm3510.c
+++ b/drivers/media/dvb-frontends/bcm3510.c
@@ -270,10 +270,18 @@ static int bcm3510_bert_reset(struct bcm3510_state *st)
if ((ret = bcm3510_readB(st,0xfa,&b)) < 0)
return ret;
- b.BERCTL_fa.RESYNC = 0; bcm3510_writeB(st,0xfa,b);
- b.BERCTL_fa.RESYNC = 1; bcm3510_writeB(st,0xfa,b);
- b.BERCTL_fa.RESYNC = 0; bcm3510_writeB(st,0xfa,b);
- b.BERCTL_fa.CNTCTL = 1; b.BERCTL_fa.BITCNT = 1; bcm3510_writeB(st,0xfa,b);
+ b.BERCTL_fa.RESYNC = 0;
+ if ((ret = bcm3510_writeB(st,0xfa,b)) < 0)
+ return ret;
+ b.BERCTL_fa.RESYNC = 1;
+ if ((ret = bcm3510_writeB(st,0xfa,b)) < 0)
+ return ret;
+ b.BERCTL_fa.RESYNC = 0;
+ if ((ret = bcm3510_writeB(st,0xfa,b)) < 0)
+ return ret;
+ b.BERCTL_fa.CNTCTL = 1; b.BERCTL_fa.BITCNT = 1;
+ if ((ret = bcm3510_writeB(st,0xfa,b)) < 0)
+ return ret;
/* clear residual bit counter TODO */
return 0;
--
2.42.0.windows.2
Powered by blists - more mailing lists