Re: [PATCH 0/2] drm/tegra: Use PTR_ERR_OR_ZERO() to simplify code

[Julia Lawall <julia.lawall@lip6.fr>]

On Tue, 19 Nov 2019, Jani Nikula wrote:

> On Tue, 19 Nov 2019, Jani Nikula <jani.nikula@linux.intel.com> wrote:
> > On Mon, 18 Nov 2019, Thierry Reding <thierry.reding@gmail.com> wrote:
> >> On Mon, Nov 18, 2019 at 07:46:10PM +0800, zhengbin wrote:
> >>> zhengbin (2):
> >>>   drm/tegra: Use PTR_ERR_OR_ZERO() to simplify code in
> >>>     tegra_bo_dumb_create
> >>>   drm/tegra: Use PTR_ERR_OR_ZERO() to simplify code in tegra_gem_create
> >>>
> >>>  drivers/gpu/drm/tegra/drm.c | 5 +----
> >>>  drivers/gpu/drm/tegra/gem.c | 5 +----
> >>>  2 files changed, 2 insertions(+), 8 deletions(-)
> >>
> >> As I explained in response to the same patches sent for other drivers
> >> already, I don't think this has any merit.
> >
> > I agree completely.
> >
> > Apparently there's a coccicheck flagging constructs like this; perhaps
> > that should be addressed. Julia?
> >
> > Things like:
> >
> > drivers/gpu/drm/tegra/gem.c:457:1-3: WARNING: PTR_ERR_OR_ZERO can be used
> >
> > leading to:
> >
> >  -	if (IS_ERR(bo))
> >  -		return PTR_ERR(bo);
> >  -
> >  -	return 0;
> >  +	return PTR_ERR_OR_ZERO(bo);
> >
> > I think we have consensus the error path and the happy day scenarios
> > should remain distinct. Moreover, I find PTR_ERR_OR_ZERO() causes me to
> > pause for a moment while the original is a crystal clear immediately.
>
> Re consensus, [1][2] and probably more. Per an email search, this pops
> up for the same stuff over and over again. Can we please just remove the
> cocci check?

OK.

julia

>
> BR,
> Jani.
>
>
> [1] http://mid.mail-archive.com/daade52d-0dfc-9365-b17c-02e7e785afad@ti.com
> [2] http://mid.mail-archive.com/20191118130022.GM4345@gilmour.lan
>
> --
> Jani Nikula, Intel Open Source Graphics Center
>
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