linux-kernel - Re: usbview 2.0 release

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Message-ID: <20121022185004.GA19645@kroah.com>
Date:	Mon, 22 Oct 2012 11:50:04 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Anil Nair <anilcoll90@...il.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Steven J. Magnani" <steve@...idescorp.com>
Subject: Re: usbview 2.0 release

On Tue, Oct 23, 2012 at 12:09:00AM +0530, Anil Nair wrote:
> Hello Greg,
> 
> I had only one doubt though the tool seems to work for rooted users only?
> when i try to launch it as a normal user it gives me error saying,
> 
> "
> Can not open the file /sys/kernel/debug/usb/devices
> 
>  Verify that you have USB compiled into your kernel,
>  have the USB core modules loaded, and have the
>  usbdevfs filesystem mounted
> 
> "

Ugh, that old usbdevfs name should go away, it's debugfs that is being
used now, thanks for pointing it out.

> That problem gets solved when using root user, is it because of the
> reason that i have to mount usbdevfs for my current user?
> The earlier usbview v1.1 tool required that that is why i am asking you.

No, debugfs needs to be mounted at /sys/kernel/debug/  Is it not mounted
that way for you?  Perhaps it is mounted with root-only access (default
for 3.7-rc1 and newer kernels)?

I should just port the thing to use libusb instead of debugfs, but
that's a larger job for such a low-priority tool.

thanks,

greg k-h
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