Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756720Ab3GQRVv (ORCPT ); Wed, 17 Jul 2013 13:21:51 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:49348 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754182Ab3GQRVt (ORCPT ); Wed, 17 Jul 2013 13:21:49 -0400 Date: Wed, 17 Jul 2013 09:35:48 -0700 From: Greg KH To: Felipe Balbi Cc: Rong Wang , Arnd Bergmann , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Rong.Wang@csr.com Subject: Re: [PATCH] usb: udc: add gadget state kobject uevent Message-ID: <20130717163548.GA14999@kroah.com> References: <20130715165209.GA6000@kroah.com> <20130716063117.GA30320@kroah.com> <20130717075706.GC5291@arwen.pp.htv.fi> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130717075706.GC5291@arwen.pp.htv.fi> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1264 Lines: 33 On Wed, Jul 17, 2013 at 10:57:06AM +0300, Felipe Balbi wrote: > Hi, > > On Mon, Jul 15, 2013 at 11:31:17PM -0700, Greg KH wrote: > > > The question is since we default GADGET, so the g_mass_storage.ko is > > > installed early but connecting to a host PC > > > is randomly, But the udev has no idea when a host PC connects our device. > > > > > > So we consider it's reasonable to let the udev know the GADGET device state. > > > Is there any alternative to our question? > > > > I thought we already export events for gadget device states, have you > > looked for them? I can't dig through the code at the moment, but this > > seems like a pretty common issue... > > > > Felipe, any ideas? > > we already expose that in sysfs. IIRC udev can act on sysfs changes, > no ? If something is polling the sysfs file, yes. If not, a change event should be sent to notify people that they need to go re-read it as something major happened (laptop docked, disk got removed, device changed state, etc.) thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/