linux-kernel - Re: 2.6.29rc1 brakes usb

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Date:	Tue, 27 Jan 2009 22:05:10 +0100
From:	Folkert van Heusden <folkert@...heusden.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: 2.6.29rc1 brakes usb

> > > > Since version 2.6.29rc1 querying cleware USb devices no longer works.
> > > > 2.6.28 works fine. 2.6.29-rc2 also no longer works.
> > > 
> > > What kind of device is this? What happens if you try to use the device?
> > > Isn't it detected, do you get an error?
> > 
> > It is a powerswitch that can be toggled via USB. Cleware also has
> > sensors (temperature, humidity, etc.) that all can be handled via a
> > commandline utility I wrote.
> > It has been a while but if i remember correctly the failing ioctl is for
> > determing the serial number of the device. That is required to talk to
> > the right device. http://www.vanheusden.com/clewarecontrol/
> 
> There's a known bug in hiddev. Please test the included patch.

Works!

Acked-by: Folkert van Heusden <folkert@...heusden.com>

> --- linux-2.6/drivers/hid/usbhid/hiddev.c.alt	2009-01-26 20:03:10.000000000 +0100
> +++ linux-2.6/drivers/hid/usbhid/hiddev.c	2009-01-26 20:03:17.000000000 +0100
> @@ -656,7 +656,7 @@ static long hiddev_ioctl(struct file *fi
>  
>  	case HIDIOCGSTRING:
>  		mutex_lock(&hiddev->existancelock);
> -		if (!hiddev->exist)
> +		if (hiddev->exist)
>  			r = hiddev_ioctl_string(hiddev, cmd, user_arg);
>  		else
>  			r = -ENODEV;


Folkert van Heusden

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