From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Date: Fri, 14 Feb 2014 18:21:33 +0000 Subject: Re: /dev entry of USB device not disappearing after detach Message-Id: <20140214182133.GF16421@kroah.com> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org Adding linux-usb@vger... On Fri, Feb 14, 2014 at 10:20:11AM -0800, Greg KH wrote: > On Fri, Feb 14, 2014 at 07:35:31PM +0200, Valentina Manea wrote: > > Hello, > > > > I am working on a driver for a virtual USB host controller. When I attach a USB > > device, everything is fine - sysfs files are created, /dev entry is > > created, device is usable. > > However, when I detach it, the /dev entry still remains. The sysfs > > files are removed, as expected. Obviously, the /dev entry is no longer > > usable, e.g. it can't be used for mounting. > > What /dev entry are you referring to? > > Did something have it held open while the device was still connected and > hasn't closed it yet? Also, the kernel is the one now responsible for managing the /dev node creation/removal, through devtmpfs, there shouldn't be any "hotplug" scripts involved in this process, so I doubt it's a userspace issue. you do have CONFIG_DEVTMPFS enabled in your kernel, right? thanks, greg k-h