From: Greg KH <gregkh@linuxfoundation.org>
To: linux-hotplug@vger.kernel.org
Subject: Re: /dev entry of USB device not disappearing after detach
Date: Fri, 14 Feb 2014 18:20:11 +0000 [thread overview]
Message-ID: <20140214182011.GE16421@kroah.com> (raw)
In-Reply-To: <CABdoFFfdXunfN+q1wJWGJbh9UGzD+9z9257ZXMM_qDhg3X8zTQ@mail.gmail.com>
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?
> The output from udevmon is here [1]. vhci_hcd is the device representing the
> USB hub and 2-1 is the bus ID of the attached device.
>
> As far as I can tell, udevd receives the remove event but, for some
> reason, the /dev entry still remains.
How about enabling debugging in the USB core to see what is going on
with the device removal path?
thanks,
greg k-h
next prev parent reply other threads:[~2014-02-14 18:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-14 17:35 /dev entry of USB device not disappearing after detach Valentina Manea
2014-02-14 18:20 ` Greg KH [this message]
2014-02-14 18:21 ` Greg KH
2014-02-15 12:38 ` Valentina Manea
2014-02-15 16:52 ` Greg KH
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