Re: [PATCH v2 01/24] input: Add ff-memless-next module

[Dmitry Torokhov]

On Wed, Apr 23, 2014 at 02:12:59PM +0200, Oliver Neukum wrote:
> On Tue, 2014-04-22 at 15:59 +0200, Michal Malý wrote:
> > +/* Some devices might have a limit on how many uncombinable effects
> > + * can be played at once */
> > +static int mlnx_upload_conditional(struct mlnx_device *mlnxdev,
> > +                                  const struct ff_effect *effect)
> > +{
> > +       struct mlnx_effect_command ecmd = {
> > +               .cmd = MLNX_UPLOAD_UNCOMB,
> > +               .u.uncomb.id = effect->id,
> > +               .u.uncomb.effect = effect
> > +       };
> > +       return mlnxdev->control_effect(mlnxdev->dev, mlnxdev->private,
> > &ecmd);
> > +}
> > +
> 
> This mean you are building the structure on the stack
> 
> 1. Are you sure nobody retains a reference?
> 2. That is needlessly inefficient

Why is it inefficient?

-- 
Dmitry
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