From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:49791 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752147AbcHHNmH (ORCPT ); Mon, 8 Aug 2016 09:42:07 -0400 Subject: Patch "can: at91_can: RX queue could get stuck at high bus load" has been added to the 4.4-stable tree To: wg@grandegger.com, amrbekhit@gmail.com, gregkh@linuxfoundation.org, mkl@pengutronix.de Cc: , From: Date: Mon, 08 Aug 2016 15:42:20 +0200 Message-ID: <14706637405127@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled can: at91_can: RX queue could get stuck at high bus load to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: can-at91_can-rx-queue-could-get-stuck-at-high-bus-load.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 43200a4480cbbe660309621817f54cbb93907108 Mon Sep 17 00:00:00 2001 From: Wolfgang Grandegger Date: Mon, 13 Jun 2016 15:44:19 +0200 Subject: can: at91_can: RX queue could get stuck at high bus load From: Wolfgang Grandegger commit 43200a4480cbbe660309621817f54cbb93907108 upstream. At high bus load it could happen that "at91_poll()" enters with all RX message boxes filled up. If then at the end the "quota" is exceeded as well, "rx_next" will not be reset to the first RX mailbox and hence the interrupts remain disabled. Signed-off-by: Wolfgang Grandegger Tested-by: Amr Bekhit Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/at91_can.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/net/can/at91_can.c +++ b/drivers/net/can/at91_can.c @@ -712,9 +712,10 @@ static int at91_poll_rx(struct net_devic /* upper group completed, look again in lower */ if (priv->rx_next > get_mb_rx_low_last(priv) && - quota > 0 && mb > get_mb_rx_last(priv)) { + mb > get_mb_rx_last(priv)) { priv->rx_next = get_mb_rx_first(priv); - goto again; + if (quota > 0) + goto again; } return received; Patches currently in stable-queue which might be from wg@grandegger.com are queue-4.4/can-at91_can-rx-queue-could-get-stuck-at-high-bus-load.patch