Re: [PATCH] missing NULL check in drivers/char/n_tty.c

[Dan Aloni <da-x@gmx.net>]

On Mon, Jun 21, 2004 at 11:46:05AM -0700, Andrew Morton wrote:
> Paul Fulghum <paulkf@microgate.com> wrote:
> >
> > 13 other drivers call ldisc.chars_in_buffer without checking
> >  for ldisc.chars_in_buffer == NULL, but only inside conditional
> >  compilation for debug output. The value is not used, only logged.
> >  These conditional debug items look like cut and paste from
> >  one serial driver to another, and I doubt
> >  they have been recently used (or used at all).
> > 
> >  Which would be better?
> >  1. Ignore this
> >  2. Fix conditional debug output to check
> >      for ldisc.chars_in_buffer==NULL
> >  3. Remove conditional debug output
> 
> Option 1 is quite valid.  There are no bugs here, yes?
> 
> If someone for some reason wants to clean all this up, the best way would
> be to require that ->chars_in_buffer always be valid, hence remove all
> those checks.

Apropos cleanups in the tty subsystem, what is the purpose of all 
the *_paranoia_check() calls that almost every driver duplicates for 
itself? Perhaps this can be removed.

-- 
Dan Aloni
da-x@colinux.org