linux-kernel - [PATCH 3/3] media: dib0700: Only touch one bit when start/stop an adapter

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Date:   Sun, 26 Sep 2021 22:51:28 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Kuron <michael.kuron@...il.com>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        pb@...uxtv.org
Subject: [PATCH 3/3] media: dib0700: Only touch one bit when start/stop an adapter

Only touch the right bit to enable/disable an adapter channel,
without touching the other adapter's one.

Tested on Nova-TD.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/media/usb/dvb-usb/dib0700_core.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/media/usb/dvb-usb/dib0700_core.c b/drivers/media/usb/dvb-usb/dib0700_core.c
index d7c5836b9271..1caabb51ea47 100644
--- a/drivers/media/usb/dvb-usb/dib0700_core.c
+++ b/drivers/media/usb/dvb-usb/dib0700_core.c
@@ -610,8 +610,6 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 
 	st->buf[3] = 0x00;
 
-	st->channel_state &= ~0x3;
-
 	if ((adap->fe_adap[0].stream.props.endpoint != 2)
 	    && (adap->fe_adap[0].stream.props.endpoint != 3)) {
 		deb_info("the endpoint number (%i) is not correct, use the adapter id instead\n",
@@ -624,7 +622,7 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 	if (onoff)
 		st->channel_state |= 1 << adapt_nr;
 	else
-		st->channel_state |= 1 << (1 - adapt_nr);
+		st->channel_state &= ~(1 << adapt_nr);
 
 	st->buf[2] |= st->channel_state;
 
-- 
2.31.1