Re: Fw: Oops in hidinput_hid_event

[Pete Zaitcev <zaitcev@redhat.com>]

On Tue, 19 Jul 2005 03:31:12 +0200, Jesper Juhl <jesper.juhl@gmail.com> wrote:

> >  void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value, struct pt_regs *regs)
> >  {
> > -       struct input_dev *input = &field->hidinput->input;
> > +       struct input_dev *input;
> >         int *quirks = &hid->quirks;
> > 
> > -       if (!input)
> > +       if (!field->hidinput)
> 
> How about
>              if (!field || !field->hdinput)
> instead?
> 
> >                 return;
> > +       input = &field->hidinput->input;

It would be more reliable, certainly. However, this is likely not what
Vojtech has intended. I do not understand how this code functions,
and I would be ashamed just adding NULL checks all over the place.
Also, the original oops happens after a certain field was accessed,
not at an argument. It's not quite clear to me what happened, because
of optimizations, but I suspect this may be it.

-- Pete