From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:37684 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732139AbeK3Bfl (ORCPT ); Thu, 29 Nov 2018 20:35:41 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Stein , Pankaj Bansal , Marc Kleine-Budde Subject: [PATCH 4.19 048/110] can: flexcan: Unlock the MB unconditionally Date: Thu, 29 Nov 2018 15:12:19 +0100 Message-Id: <20181129135923.203428995@linuxfoundation.org> In-Reply-To: <20181129135921.231283053@linuxfoundation.org> References: <20181129135921.231283053@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pankaj Bansal commit 5178b7cd8e42448b1041716f124734eaaa36ca50 upstream. Unlock the MB irrespective of reception method being FIFO or timestamp based. It is optional but recommended to unlock Mailbox as soon as possible and make it available for reception. Reported-by: Alexander Stein Signed-off-by: Pankaj Bansal Cc: linux-stable Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/flexcan.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -720,9 +720,14 @@ static unsigned int flexcan_mailbox_read priv->write(BIT(n - 32), ®s->iflag2); } else { priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1); - priv->read(®s->timer); } + /* Read the Free Running Timer. It is optional but recommended + * to unlock Mailbox as soon as possible and make it available + * for reception. + */ + priv->read(®s->timer); + return 1; }