Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932093AbcDRDLn (ORCPT ); Sun, 17 Apr 2016 23:11:43 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:36388 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753448AbcDRCfk (ORCPT ); Sun, 17 Apr 2016 22:35:40 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yoshihiro Shimoda , Felipe Balbi Subject: [PATCH 4.5 094/124] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer Date: Mon, 18 Apr 2016 11:29:26 +0900 Message-Id: <20160418022620.557190006@linuxfoundation.org> X-Mailer: git-send-email 2.8.0 In-Reply-To: <20160418022615.726954227@linuxfoundation.org> References: <20160418022615.726954227@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 989 Lines: 32 4.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yoshihiro Shimoda commit 6490865c67825277b29638e839850882600b48ec upstream. This patch adds a code to surely disable TX IRQ of the pipe before starting TX DMAC transfer. Otherwise, a lot of unnecessary TX IRQs may happen in rare cases when DMAC is used. Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support") Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/renesas_usbhs/fifo.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -890,6 +890,7 @@ static int usbhsf_dma_prepare_push(struc pkt->trans = len; + usbhsf_tx_irq_ctrl(pipe, 0); INIT_WORK(&pkt->work, xfer_work); schedule_work(&pkt->work);