Re: [PATCH 1/2] drm/bridge: imx8qxp-ldb: cleanup return value

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

Hello Liu,

On Fri, 7 Mar 2025 14:42:12 +0800
Liu Ying <victor.liu@nxp.com> wrote:

> On 03/07/2025, Luca Ceresoli wrote:
> > 'ret' can only be 0 at this point, being preceded by a 'if (ret) return
> > ret;'. So return 0 for clarity.
> > 
> > Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
> > ---
> >  drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
> > index 7bce2305d676714cdec7ce085cb53b25ce42f8e7..bee1c6002d5f84dc33b6d5dc123726703baa427e 100644
> > --- a/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
> > +++ b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
> > @@ -665,7 +665,7 @@ static int imx8qxp_ldb_probe(struct platform_device *pdev)
> >  
> >  	ldb_add_bridge_helper(ldb, &imx8qxp_ldb_bridge_funcs);
> >  
> > -	return ret;
> > +	return 0;  
> 
> I guess this is not the only place across the kernel tree where this cleanup
> could be done.  So, maybe use some tools to cleanup them all?

I had stumbled upon this as I was doing some changes to this function,
and needed to understand the code flow. Definitely 'ret 0' would have
made it  immediately clear that all the code between the last 'if (ret)
return ret;' and the final 'return ret' is not allowed to fail.

I think this change would (slightly, but still) improve future readers'
life.

Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com