linux-kernel - Re: [PATCH v2 BlueZ] hid2hci: Fix udev rules for linux-4.14+

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Date:   Wed, 5 Dec 2018 08:06:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Ville Syrjala <ville.syrjala@...ux.intel.com>
Cc:     linux-bluetooth@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Kay Sievers <kay.sievers@...y.org>,
        Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>,
        systemd-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 BlueZ] hid2hci: Fix udev rules for linux-4.14+

On Tue, Dec 04, 2018 at 10:41:17PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> 
> Since commit 1455cf8dbfd0 ("driver core: emit uevents when
> device is bound to a driver") the kernel started emitting
> "bind" and "unbind" uevents which confuse the hid2hci
> udev rules.
> 
> The symptoms on an affected machine (Dell E5400 in my case)
> include bluetooth devices not appearing and udev hogging
> the cpu as it's busy processing a constant stream of these
> "bind"+"unbind" uevents.

What is causing a "stream" of bind and unbind events?  This only happens
when a device is attached to a driver or removed from a driver, which is
caused by something else happening.  This should not be a normal
occurance, unless something odd is happening to your hardware?

thanks,

greg k-h