Am Dienstag, 4. November 2008 23:57:02 schrieb Jiri Slaby:

On 11/04/2008 11:51 PM, Oliver Neukum wrote:

quoted

If you call usb_register_dev() before you set
hiddev_table[usbhid->intf->minor - HIDDEV_MINOR_BASE]
this check in hiddev_open() may fail:
      if (i >= HIDDEV_MINORS || i < 0 || !hiddev_table[i])
              return -ENODEV;

I think, that's the point. You should also get ENODEV if you don't call
usb_register_dev(), create a node for non-existent minor manually and try to
open it. It behaves the same as if there was a lock you suggested...

But by calling usb_register_dev() we also cause the kernel to emit a
hotplug event that tells udev that the device exists.

	Regards
		Oliver

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