[Outreachy kernel] [RESEND PATCH] drm: Remove obsolete "This is gross" comment

[Julia Lawall]

On Thu, 21 Sep 2017, Haneen Mohammed wrote:

> On Thu, Sep 21, 2017 at 11:16:44PM +0200, Julia Lawall wrote:
> >
> >
> > On Thu, 21 Sep 2017, Haneen Mohammed wrote:
> >
> > > Remove obsolete comment which was initially added in 2008 to annotate
> > > that idr_find() was used before idr_remove() since idr_remove() didn't
> > > use to return feedback. The comment now is irrelevant with
> > > commit f6cd7daecff5 ("drm: Release driver references to handle before
> > > making it available again").
> >
> > Why did you send it again?
> >
> > julia
> >
>
> I forgot to include the dri-devel mailing list for the first patch.

OK, it should have been a v2 with a comment about what changed.  Even if
it is not a technical issue, it saves people wondering about what
happened.

julia

>
> Haneen
>
> > >
> > > Signed-off-by: Haneen Mohammed <hamohammed.sa at gmail.com>
> > > ---
> > >  drivers/gpu/drm/drm_gem.c | 9 ---------
> > >  1 file changed, 9 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> > > index c55f338..b9bddaa 100644
> > > --- a/drivers/gpu/drm/drm_gem.c
> > > +++ b/drivers/gpu/drm/drm_gem.c
> > > @@ -282,15 +282,6 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle)
> > >  {
> > >  	struct drm_gem_object *obj;
> > >
> > > -	/* This is gross. The idr system doesn't let us try a delete and
> > > -	 * return an error code.  It just spews if you fail at deleting.
> > > -	 * So, we have to grab a lock around finding the object and then
> > > -	 * doing the delete on it and dropping the refcount, or the user
> > > -	 * could race us to double-decrement the refcount and cause a
> > > -	 * use-after-free later.  Given the frequency of our handle lookups,
> > > -	 * we may want to use ida for number allocation and a hash table
> > > -	 * for the pointers, anyway.
> > > -	 */
> > >  	spin_lock(&filp->table_lock);
> > >
> > >  	/* Check if we currently have a reference on the object */
> > > --
> > > 2.7.4
> > >
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