From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161134AbWASFcw (ORCPT ); Thu, 19 Jan 2006 00:32:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161136AbWASFcw (ORCPT ); Thu, 19 Jan 2006 00:32:52 -0500 Received: from dsl093-040-174.pdx1.dsl.speakeasy.net ([66.93.40.174]:43165 "EHLO aria.kroah.org") by vger.kernel.org with ESMTP id S1161134AbWASFcw (ORCPT ); Thu, 19 Jan 2006 00:32:52 -0500 Date: Wed, 18 Jan 2006 21:33:03 -0800 From: Greg KH To: "Mukund JB." Cc: linux-kernel@vger.kernel.org Subject: Re: clarity on kref needed. Message-ID: <20060119053303.GA21467@kroah.com> References: <3AEC1E10243A314391FE9C01CD65429B28BF15@mail.esn.co.in> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3AEC1E10243A314391FE9C01CD65429B28BF15@mail.esn.co.in> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 19, 2006 at 10:35:37AM +0530, Mukund JB. wrote: > > > > -----Original Message----- > > From: Greg KH [mailto:greg@kroah.com] > > Sent: Thursday, January 19, 2006 10:33 AM > > To: Mukund JB. > > Cc: linux-kernel@vger.kernel.org > > Subject: Re: clarity on kref needed. > > > > > > On Thu, Jan 19, 2006 at 10:15:51AM +0530, Mukund JB. wrote: > > > > > > > > I have gone through kref and am planning to implement then > > > > in my usb driver. > > > > > > > > What kind of usb driver? > > > It is a finger print authentication USB driver. it doesn ot do the > > > authgentication but transports data to the application which really > > > does some processing. > > > > You shouldn't need a kernel driver for this, it can be done > > in userspace > > with libusb/usbfs, right? > > I mean I will register a char driver. I will just write a simple char > kernel module to read data from the USB device and zero copy it to the > userspace application. I guess that is the minimum work we need to do. You can do that from userspace with libusb/usbfs with no kernel driver needed. Why not do that instead? > Is there any other way using libusb/usbfs in which we can do this > without a need of USB kernel driver? Yes, use libusb/usbfs :) > > > No, I did not find any Documentation/kref.txt. > > > But I have read about kred in the link below: > > > > > http://developer.osdl.org/dev/robustmutexes/src/fusyn.hg/Docum > entation/kref.txt > > > > > >Is kref depricated because I find nothing related to it in linux/Documentation/? > > > What kernel version are you looking at? Look in the kernel source tree > > from kernel.org. What kernel tree are you building your driver against. > > I am planning it for 2.6.11.12. That's a pretty old kernel version, why not use the latest version? thanks, greg k-h