From patchwork Mon May 18 17:37:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 11556079 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 42B67913 for ; Mon, 18 May 2020 18:20:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A79420671 for ; Mon, 18 May 2020 18:20:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589826000; bh=ZsJn7yzuxpLIcnmErC2GkQPXYoeEaR6UqPbjZR5fag4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=dWWGLV74Kakg+0CRX4jucgn59J0evQsp3avx33pS4j4cswG4FdYfI/xXJyn6C+x8T NjwnYf3nsj+SoqLt3EWIHm25RtzJkG+ZzJ5SIwkfpyBtO8gF0NYqTE2zIFDIM9FxXP pDwdgxaHo8ebmTgVBv6tBVWPLkCArr72oWBdf4No= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732449AbgERST4 (ORCPT ); Mon, 18 May 2020 14:19:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:57610 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731158AbgERRxd (ORCPT ); Mon, 18 May 2020 13:53:33 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 95A11207C4; Mon, 18 May 2020 17:53:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589824413; bh=ZsJn7yzuxpLIcnmErC2GkQPXYoeEaR6UqPbjZR5fag4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d7gvwFDN15uaK6L6tqI6KrQ9lJ8It6/JLke38W7VdwHJmRCn4FF1qZdAc3Q1qPjfm tpHZCQZqrQWszAFMMB431WVETyvt6xtKR3WRiN7MEC4+g5BvRv7QAZhVr9jpqTBeS6 koBeK4hzm3Hk0vj6fQoDCw95gv+pU6mmfcIu1fJo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, YongQin Liu , Anurag Kumar Vulisha , Yang Fei , Thinh Nguyen , Tejas Joglekar , Andrzej Pietrasiewicz , Jack Pham , Josh Gao , Todd Kjos , Felipe Balbi , linux-usb@vger.kernel.org, John Stultz Subject: [PATCH 4.19 67/80] dwc3: Remove check for HWO flag in dwc3_gadget_ep_reclaim_trb_sg() Date: Mon, 18 May 2020 19:37:25 +0200 Message-Id: <20200518173503.872586878@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200518173450.097837707@linuxfoundation.org> References: <20200518173450.097837707@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: John Stultz commit 00e21763f2c8cab21b7befa52996d1b18bde5c42 upstream. The check for the HWO flag in dwc3_gadget_ep_reclaim_trb_sg() causes us to break out of the loop before we call dwc3_gadget_ep_reclaim_completed_trb(), which is what likely should be clearing the HWO flag. This can cause odd behavior where we never reclaim all the trbs in the sg list, so we never call giveback on a usb req, and that will causes transfer stalls. This effectively resovles the adb stalls seen on HiKey960 after userland changes started only using AIO in adbd. Cc: YongQin Liu Cc: Anurag Kumar Vulisha Cc: Yang Fei Cc: Thinh Nguyen Cc: Tejas Joglekar Cc: Andrzej Pietrasiewicz Cc: Jack Pham Cc: Josh Gao Cc: Todd Kjos Cc: Felipe Balbi Cc: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org Cc: stable@vger.kernel.org #4.20+ Signed-off-by: John Stultz Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/gadget.c | 3 --- 1 file changed, 3 deletions(-) --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2279,9 +2279,6 @@ static int dwc3_gadget_ep_reclaim_trb_sg for_each_sg(sg, s, pending, i) { trb = &dep->trb_pool[dep->trb_dequeue]; - if (trb->ctrl & DWC3_TRB_CTRL_HWO) - break; - req->sg = sg_next(s); req->num_pending_sgs--;