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
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