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=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable 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 98358C04A6B for ; Wed, 8 May 2019 12:02:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6F68320989 for ; Wed, 8 May 2019 12:02:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728135AbfEHMCA (ORCPT ); Wed, 8 May 2019 08:02:00 -0400 Received: from mga07.intel.com ([134.134.136.100]:22852 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727623AbfEHMCA (ORCPT ); Wed, 8 May 2019 08:02:00 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 May 2019 05:01:59 -0700 X-ExtLoop1: 1 Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.164]) ([10.237.72.164]) by FMSMGA003.fm.intel.com with ESMTP; 08 May 2019 05:01:57 -0700 Subject: Re: [PATCH v2] usb: host: xhci: Support running urb giveback in tasklet context To: Suwan Kim Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org References: <20190401141611.10087-1-suwan.kim027@gmail.com> <20190507160219.GB2427@localhost.localdomain> From: Mathias Nyman Message-ID: <0529be1d-57d6-18b8-6f62-49f4b3931e1a@linux.intel.com> Date: Wed, 8 May 2019 15:04:33 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190507160219.GB2427@localhost.localdomain> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 7.5.2019 19.02, Suwan Kim wrote: > On Mon, Apr 01, 2019 at 11:16:11PM +0900, Suwan Kim wrote: >> Patch "USB: HCD: support giveback of URB in tasklet context"[1] >> introduced giveback of urb in tasklet context. [1] This patch was >> applied to ehci but not xhci. [2] This patch significantly reduces >> the hard irq time of xhci. Especially for uvc driver, the hard irq >> including the uvc completion function runs quite long but applying >> this patch reduces the hard irq time of xhci. >> > > I sent this patch a month ago but got no answer. > Is there any feedback for this? > Please let me know if there are any faults or it needs more tests. > I'll add this to a internal tree first, and let it sit there for a few weeks, trying to catch possible bugs this change could expose. -Mathias