linux-kernel - Re: [Bluez-users] Lost connections

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Date:	Fri, 30 Nov 2007 09:06:52 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Jiri Kosina" <jikos@...os.cz>
Cc:	"Marcel Holtmann" <marcel@...tmann.org>, bgsmith@...dcable.com,
	"BlueZ users" <bluez-users@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Bluez-users] Lost connections - mouse and keyboard

On Nov 30, 2007 4:43 AM, Jiri Kosina <jikos@...os.cz> wrote:
> On Thu, 29 Nov 2007, Marcel Holtmann wrote:
>
> > > >Nov 28 18:53:39 pico kernel: WARNING: at drivers/hid/hid-core.c:784
> [ ... ]
>
> > > Does bluetooth input devices have something to do with usbhid? I don't
> > > know, perhaps this is another problem in kernel.
> > in case you have a HID proxy dongle the usbhid driver can be involved. And
> > since this is hiddev, then it will be caused by the hid2hci program.
>
> Absolutely.
>
> This particular warning means, that someone (usually indeed hid2hci)
> passed usage through hiddev that was out of bounds, with respect to the
> device's report descriptor.

Is this behaviour the normal one? IMHO, userspace program should not
cause kernel warnings like this no mater what input from users.

>
> This usually means that hid2hci has chosen the wrong method to switch the
> modes. Unfortunately, it's not easy to implement always the switching
> properly, if we don't know the vendor-specific packet that has to be sent.
>
> --
> Jiri Kosina
>
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