From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1379EC433E2 for ; Thu, 3 Sep 2020 07:21:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D6809207EA for ; Thu, 3 Sep 2020 07:21:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728113AbgICHVL (ORCPT ); Thu, 3 Sep 2020 03:21:11 -0400 Received: from mga09.intel.com ([134.134.136.24]:56047 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725943AbgICHVK (ORCPT ); Thu, 3 Sep 2020 03:21:10 -0400 IronPort-SDR: bmXDHYbF+kvCAhCO0pZG2AeGuZsvY2AwLbGC57HJDgmv+naUFOUA5JcTpfJlhNmWJ6rgKbPVvJ z3buklLmhX7w== X-IronPort-AV: E=McAfee;i="6000,8403,9732"; a="158516983" X-IronPort-AV: E=Sophos;i="5.76,385,1592895600"; d="scan'208";a="158516983" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2020 00:20:56 -0700 IronPort-SDR: iljunDC2aqSiM/SIissT5dKpRy289U9MGh+F83EU2SODTNGz9Q6wcmOSpK2LT3oAD/wD7u04xl dYU+gcqcncaw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,385,1592895600"; d="scan'208";a="502962627" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by fmsmga005.fm.intel.com with ESMTP; 03 Sep 2020 00:20:47 -0700 Subject: Re: [PATCH v2] usb: xhci: add debugfs support for ep with stream To: Jun Li , "mathias.nyman@intel.com" Cc: "gregkh@linuxfoundation.org" , "linux-usb@vger.kernel.org" , dl-linux-imx References: <1594901321-6992-1-git-send-email-jun.li@nxp.com> <5257ec39-9f59-58fe-661f-a1cd69955f1e@linux.intel.com> From: Mathias Nyman Openpgp: preference=signencrypt Autocrypt: addr=mathias.nyman@linux.intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org >> I think this debugfs code is just called too early. It shouldn't need to check new_ring >> pointer at all. >> >> I wrote a fix that changes the order and makes sure endpoint is enabled and ring >> pointer is set correctly before we call xhci_debugfs_create_endpoint() >> >> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.o >> rg%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Fmnyman%2Fxhci.git%2Fcommit%2F%3Fh%3Dfo >> r-usb-linus%26id%3Dcf99aef5624a592fd4f3374c7060bfa1a65f15df&data=02%7C01%7 >> Cjun.li%40nxp.com%7C73e4663a6f6641fbb8b308d84f3d021a%7C686ea1d3bc2b4c6fa92cd99 >> c5c301635%7C0%7C0%7C637346470803922895&sdata=i4DfCW8EVUSAWnzb8Ql4jPjAOD5wp >> tfbaMrO8vKvtDc%3D&reserved=0 > > This is a good place for non-zero Eps, but does not cover ep0. > ep0 is special, it's not touched in these add/drop endpoint or check bandwidth functions. ep0 ring is allocated earlier during slot creation in xhci_alloc_virt_device() ... /* Allocate endpoint 0 ring */ dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, 0, flags); and for debugfs ep00 is added manually together with the slot xhci_debugfs_create_slot() ... xhci_debugfs_create_ring_dir(xhci, &dev->eps[0].ring, "ep00", priv->root); So regarding ep0 the change should be ok. -Mathias