linux-kernel - [PATCH 3.19 043/175] [media] lmedm04: Increase Interupt due time to 200 msec

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Message-Id: <20150304061033.450993412@linuxfoundation.org>
Date:	Tue,  3 Mar 2015 22:13:41 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Malcolm Priestley <tvboxspy@...il.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: [PATCH 3.19 043/175] [media] lmedm04: Increase Interupt due time to 200 msec

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Malcolm Priestley <tvboxspy@...il.com>

commit cfcd7b825892cb498c6bcb13257f2141f7eacb76 upstream.

Ocassionally the device fails to report back an interrupt urb status which
results in false no lock trigger on the RS2000 demodulator.

Increase time from 60 msecs to 200 msecs.

Signed-off-by: Malcolm Priestley <tvboxspy@...il.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/usb/dvb-usb-v2/lmedm04.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/drivers/media/usb/dvb-usb-v2/lmedm04.c
+++ b/drivers/media/usb/dvb-usb-v2/lmedm04.c
@@ -344,9 +344,10 @@ static void lme2510_int_response(struct
 
 	usb_submit_urb(lme_urb, GFP_ATOMIC);
 
-	/* interrupt urb is due every 48 msecs while streaming
-	 *	add 12msecs for system lag */
-	st->int_urb_due = jiffies + msecs_to_jiffies(60);
+	/* Interrupt urb is due every 48 msecs while streaming the buffer
+	 * stores up to 4 periods if missed. Allow 200 msec for next interrupt.
+	 */
+	st->int_urb_due = jiffies + msecs_to_jiffies(200);
 }
 
 static int lme2510_int_read(struct dvb_usb_adapter *adap)


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