Re: [BK PATCH] USB changes for 2.5.34

Greg KH
2002-09-10T00:17:58Z

On Mon, Sep 09, 2002 at 05:17:40PM -0700, Linus Torvalds wrote:
>
> Greg, please don't do this
>
> > ChangeSet@1.614, 2002-09-05 08:33:20-07:00, greg@kroah.com
> > USB: storage driver: replace show_trace() with BUG()
>
> that BUG() thing is _way_ out of line, and has killed a few of my machines
> several times for no good reason. It actively hurts debuggability, because
> the machine is totally dead after it, and the whole and ONLY point of
> BUG() messages is to help debugging and make it clear that we can't handle
> something.
>
> In this case, we _can_ handle it, and we're much better off with a machine
> that works and that you can look up the messages with than killing it.
>
> Rule of thumb: BUG() is only good for something that never happens and
> that we really have no other option for (ie state is so corrupt that
> continuing is deadly).

Sorry, Matt told me to add it, I didn't realize the background. Should
I leave it as show_trace(), or just remove it? Do you want me to send
you another changeset to put it back?

thanks,

greg k-h