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Date:   Fri, 5 Jul 2019 10:40:36 -0400 (EDT)
From:   Alan Stern <stern@rowland.harvard.edu>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc:     David Howells <dhowells@redhat.com>, <viro@zeniv.linux.org.uk>,
        Casey Schaufler <casey@schaufler-ca.com>,
        Stephen Smalley <sds@tycho.nsa.gov>,
        <nicolas.dichtel@6wind.com>, <raven@themaw.net>,
        Christian Brauner <christian@brauner.io>,
        <keyrings@vger.kernel.org>, <linux-usb@vger.kernel.org>,
        <linux-security-module@vger.kernel.org>,
        <linux-fsdevel@vger.kernel.org>, <linux-api@vger.kernel.org>,
        <linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 6/9] Add a general, global device notification watch list
 [ver #5]
In-Reply-To: <20190705084459.GA2579@kroah.com>
Message-ID: <Pine.LNX.4.44L0.1907051038550.1606-100000@iolanthe.rowland.org>
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On Fri, 5 Jul 2019, Greg Kroah-Hartman wrote:

> On Fri, Jul 05, 2019 at 09:04:17AM +0100, David Howells wrote:
> > Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
> > 
> > > Hm, good point, but there should be some way to test this to verify it
> > > works.  Maybe for the other types of events?
> > 
> > Keyrings is the simplest.  keyutils's testsuite will handle that.  I'm trying
> > to work out if I can simply make every macro in there that does a modification
> > perform a watch automatically to make sure the appropriate events happen.
> 
> That should be good enough to test the basic functionality.  After this
> gets merged I'll see if I can come up with a way to test the USB
> stuff...

You can create USB connect and disconnect events programmatically by
using dummy-hcd with gadget-zero.  Turning off the port's POWER feature
will cause a disconnect, and turning it back on will cause a connect.

Alan Stern