linux-kernel - Re: Kernel 2.6.22-rc3 breaks USB: Unable to get HID descriptor (error sending control message: Operation not permitted)

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Date:	Sun, 3 Jun 2007 08:29:35 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Oliver Neukum <oneukum@...e.de>
cc:	linux-usb-devel@...ts.sourceforge.net,
	Jiri Kosina <jikos@...os.cz>, linux-kernel@...r.kernel.org
Subject: Re: Kernel 2.6.22-rc3 breaks USB: Unable to get HID descriptor (error
 sending control message: Operation not permitted)



On Sun, 3 Jun 2007, Oliver Neukum wrote:

> Am Sonntag, 3. Juni 2007 12:36 schrieb Justin Piszcz:
>>
>> On Sun, 3 Jun 2007, Jiri Kosina wrote:
>>
>>> On Sat, 2 Jun 2007, Justin Piszcz wrote:
>
>>>> failed to claim USB device, trying 2 more time(s)...
>>>> detaching kernel driver from USB device...
>>>
>>> Could you please provide strace outputs (or put it on the web somewhere if
>>> it's too big) for the failing and succeeding claiming of the device?
>
> static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
> {
> 	struct dev_state *ps = file->private_data;
> 	struct usb_device *dev = ps->dev;
> 	void __user *p = (void __user *)arg;
> 	int ret = -ENOTTY;
>
> 	if (!(file->f_mode & FMODE_WRITE))
> 		return -EPERM;
>
> That check fails as your application falls back to opening read only in
> case of insufficient permissions. Did you change some udev rules?
>
> 	Regards
> 		Oliver
>

Nope and just to verify that I made sure I tested this a couple times. 
Booted 2.6.21.3 no problems, then booted 2.6.23-rc3 w/out your patch, 
problem happens again.

Justin.
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