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[23.128.96.18]) by mx.google.com with ESMTP id s7si2120978ejs.393.2021.09.29.22.34.00; Wed, 29 Sep 2021 22:34:25 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=jdN8+0NQ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348049AbhI3FcO (ORCPT + 99 others); Thu, 30 Sep 2021 01:32:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:59618 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347737AbhI3FcN (ORCPT ); Thu, 30 Sep 2021 01:32:13 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 100D16140F; Thu, 30 Sep 2021 05:30:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632979831; bh=sadiBAmx2XKGI77141lruBUtIqdhRPUme9yO+YweVvA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jdN8+0NQc/wzdGQCGsaJW98+em0Y1LOpof9mjh2aonFYgOJkfKagfpRNCiH17Wkdd /DxKeep7+xskwP76wMm6AJrZTNKKZ5prMyAIdplq9DuLxptZwC2+iWN5ZIxAUvfdX6 ds+GJH5aFSonJib5VBjOiUb19KTNY1ciab0P4Agg= Date: Thu, 30 Sep 2021 07:30:26 +0200 From: Greg Kroah-Hartman To: Rajat Jain Cc: Alan Stern , Thinh Nguyen , Mathias Nyman , Andrew Lunn , Chris Chiu , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, levinale@google.com, bleung@google.com, rajatxjain@gmail.com, jsbarnes@google.com, pmalani@google.com Subject: Re: [PATCH 1/2] usb: hub: Mark root hubs on removable devices, as removable. Message-ID: References: <20210929224823.556943-1-rajatja@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210929224823.556943-1-rajatja@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 29, 2021 at 03:48:22PM -0700, Rajat Jain wrote: > Currently all usb root hubs are always marked as DEVICE_REMOVABLE_UNKNOWN > unconditionally. Let us try to help the users to identify the removable > root hubs, by checking the device on which the root hub sits. If the base > (parent) device on which the root hub sits, is removable (e.g. on > thunderbolt docks), then the roothub is also marked as removable. > > Signed-off-by: Rajat Jain > --- > drivers/usb/core/hub.c | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c > index 86658a81d284..45d1c81b121d 100644 > --- a/drivers/usb/core/hub.c > +++ b/drivers/usb/core/hub.c > @@ -2440,8 +2440,16 @@ static void set_usb_port_removable(struct usb_device *udev) > > dev_set_removable(&udev->dev, DEVICE_REMOVABLE_UNKNOWN); > > - if (!hdev) > + if (!hdev) { > + /* > + * If the root hub sits on a removable device, mark the root hub > + * removable as well. This helps with the USB root hubs sitting > + * on the thunderbolt docks. > + */ > + if (udev->dev.parent && dev_is_removable(udev->dev.parent)) > + dev_set_removable(&udev->dev, DEVICE_REMOVABLE); > return; > + } How far "up the chain" are you going to go here? What if the thunderbolt device is on a PCI device that can be removed? What if that PCI device is on a PCI bus that can be removed? Is a USB controller on a docking device really "removable"? The goal here is to say if this device itself is removable in the sense of "I can yank this out", and a roothub is not that type of device. What problem are you trying to solve with this series? thanks, greg k-h