linux-kernel - Re: [PATCH v1] drm/sun4i: Return from the function in error condition

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Date:   Wed, 22 Jun 2022 09:57:25 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Saud Farooqui <farooqui_saud@...mail.com>
Cc:     jernej.skrabec@...il.com, samuel@...lland.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, wens@...e.org, daniel@...ll.ch
Subject: Re: [PATCH v1] drm/sun4i: Return from the function in error condition

Hi,

On Tue, Jun 21, 2022 at 09:44:27PM +0500, Saud Farooqui wrote:
> Added return statement in sun4i_layer_format_mod_supported()
> in case of error.
> 
> Signed-off-by: Saud Farooqui <farooqui_saud@...mail.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_layer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
> index 6d43080791a0..85fb9e800ddf 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> @@ -117,7 +117,7 @@ static bool sun4i_layer_format_mod_supported(struct drm_plane *plane,
>  	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
>  
>  	if (IS_ERR_OR_NULL(layer->backend->frontend))
> -		sun4i_backend_format_is_supported(format, modifier);
> +		return sun4i_backend_format_is_supported(format, modifier);

While there's a bug, it definitely isn't what your commit message
describe.

Frontends only available on some SoCs and are thus optional in the
driver.

If the frontend pointer isn't set, it means that it isn't there and thus
we try to figure out the format through the backend that is always
there.

Maxime

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