Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966344AbcDLUxa (ORCPT ); Tue, 12 Apr 2016 16:53:30 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:50702 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757418AbcDLUx2 (ORCPT ); Tue, 12 Apr 2016 16:53:28 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Yoshihiro Shimoda , Felipe Balbi , Kamal Mostafa Subject: [PATCH 4.2.y-ckt 17/70] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer Date: Tue, 12 Apr 2016 13:52:02 -0700 Message-Id: <1460494375-30070-18-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1460494375-30070-1-git-send-email-kamal@canonical.com> References: <1460494375-30070-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 4.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1179 Lines: 34 4.2.8-ckt8 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ 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: Kamal Mostafa --- drivers/usb/renesas_usbhs/fifo.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c index 32df738..f1893e0 100644 --- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -890,6 +890,7 @@ static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done) pkt->trans = len; + usbhsf_tx_irq_ctrl(pipe, 0); INIT_WORK(&pkt->work, xfer_work); schedule_work(&pkt->work); -- 2.7.4