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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A848DC433EF for ; Mon, 2 May 2022 12:04:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1384880AbiEBMIN (ORCPT ); Mon, 2 May 2022 08:08:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57634 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1384879AbiEBMIK (ORCPT ); Mon, 2 May 2022 08:08:10 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D51221408C for ; Mon, 2 May 2022 05:04:41 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 7ED30B816B3 for ; Mon, 2 May 2022 12:04:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 28088C385AC; Mon, 2 May 2022 12:04:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1651493079; bh=pKzZvg7MpGzPlIun9lCbw3qGhh7M4H2uW4enE/m0eHk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=vF263QpEmzh1ztiG5OLeeEjY4vEKFc6Gn3pHRLwytmFAJG5MW/YAn6GbwuN2TJSW4 +rbHMOWHvDJSDNHbE/OGf8Be92lYyKJ8X4Pz57/VKbII8F9h6CScV+DESdtCcIJf6o XhdNJwxVNMZ2vVAcHdtZi93vsR4v0lLxzgM4nCDg= Date: Mon, 2 May 2022 14:04:38 +0200 From: Greg KH To: Jose Ignacio Tornos Martinez Cc: stern@rowland.harvard.edu, linux-usb@vger.kernel.org, marcel@holtmann.org Subject: Re: [PATCH] Bluetooth: btusb: CSR chip hangs when unbound Message-ID: References: <20220502070758.67396-1-jtornosm@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220502070758.67396-1-jtornosm@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Mon, May 02, 2022 at 09:07:58AM +0200, Jose Ignacio Tornos Martinez wrote: > Bluetooth Dongles with CSR chip (i.e. USB Bluetooth V4.0 Dongle by > Trust) hang when they are unbound from 'unbind' sysfs entry and > can not be bound again. > > The reason is CSR chip hangs when usb configuration command with > index 0 (used to unconfigure) is sent during disconnection. > > To avoid this unwanted result, it is necessary not to send this > command for CSR chip when usb device is unbound, so a new quirk > has been created for this device. > > Athough device is not unconfigured, it is better to avoid device > hanging to be able to operate. Even bluetooth can be previously > turned off. > On the other hand, this is not important if usb device is going to > be bound again (normal behavior), i.e. with usbip. > --- Also, the subject is totally wrong :(