Re: [patch] drivers: Fix bogus 0 error return in device_add()

[Greg KH <gregkh@suse.de>]

On Thu, Dec 10, 2009 at 07:32:49PM -0000, Thomas Gleixner wrote:
> If device_add() is called with a device which does not have dev->p set
> up, then device_private_init() is called. If that succeeds, then the
> error variable is set to 0. Now if the dev_name(dev) check further
> down fails, then device_add() correctly terminates, but returns 0.
> That of course lets the driver progress. If later another driver uses
> this half set up device as parent then device_add() of the child
> device explodes and renders sysfs completely unusable.
> 
> Set the error to -EINVAL if dev_name() check fails.

That's a good catch, thanks.

Is anything currently triggering this?  Or did you just find it by
reading the code?

thanks,

greg k-h