Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754335AbcDZXSm (ORCPT ); Tue, 26 Apr 2016 19:18:42 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:40640 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754155AbcDZXSf (ORCPT ); Tue, 26 Apr 2016 19:18:35 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Felipe Balbi" , "Yoshihiro Shimoda" Date: Wed, 27 Apr 2016 01:02:24 +0200 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 061/115] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8426:ae4:c500:9cba:69ae:962d:6167 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1042 Lines: 31 3.2.80-rc1 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 [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- 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 @@ -932,6 +932,7 @@ static int usbhsf_dma_try_pop(struct usb pkt->trans = len; + usbhsf_tx_irq_ctrl(pipe, 0); tasklet_init(&fifo->tasklet, usbhsf_dma_prepare_tasklet, (unsigned long)pkt);