Re: [PATCH 02/24] drm/omap: cleanup fbdev init/free

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Tomi,

Thank you for the patch.

On Monday, 12 February 2018 11:44:32 EET Tomi Valkeinen wrote:
> omap_fbdev_init() and omap_fbdev_free() use priv->fbdev directly.
> However, omap_fbdev_init() returns the fbdev, and omap_drv.c also
> assigns the return value to priv->fbdev. This is slightly confusing.
> 
> Clean this up by removing the omap_fbdev_init() return value, as we
> don't care whether fbdev init succeeded or not. Also change omap_drv.c
> to call omap_fbdev_init() always, and omap_fbdev_init() does the check
> if fbdev was initialized.

I assume you mean omap_fbdev_free() for the last two occurrences (and on a 
side note I wonder whether we should rename it to omap_fbdev_cleanup() or 
omap_fbdev_fini() for symmetry with omap_fbdev_init()).

> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
> ---
>  drivers/gpu/drm/omapdrm/omap_drv.c   |  9 ++++-----
>  drivers/gpu/drm/omapdrm/omap_fbdev.c | 10 +++++-----
>  drivers/gpu/drm/omapdrm/omap_fbdev.h |  5 ++---
>  3 files changed, 11 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c
> b/drivers/gpu/drm/omapdrm/omap_drv.c index dd68b2556f5b..485684c637ff
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> @@ -584,7 +584,7 @@ static int pdev_probe(struct platform_device *pdev)
>  	for (i = 0; i < priv->num_crtcs; i++)
>  		drm_crtc_vblank_off(priv->crtcs[i]);
> 
> -	priv->fbdev = omap_fbdev_init(ddev);
> +	omap_fbdev_init(ddev);
> 
>  	drm_kms_helper_poll_init(ddev);
>  	omap_modeset_enable_external_hpd();
> @@ -602,8 +602,8 @@ static int pdev_probe(struct platform_device *pdev)
>  err_cleanup_helpers:
>  	omap_modeset_disable_external_hpd();
>  	drm_kms_helper_poll_fini(ddev);
> -	if (priv->fbdev)
> -		omap_fbdev_free(ddev);
> +
> +	omap_fbdev_free(ddev);
>  err_cleanup_modeset:
>  	drm_mode_config_cleanup(ddev);
>  	omap_drm_irq_uninstall(ddev);
> @@ -632,8 +632,7 @@ static int pdev_remove(struct platform_device *pdev)
>  	omap_modeset_disable_external_hpd();
>  	drm_kms_helper_poll_fini(ddev);
> 
> -	if (priv->fbdev)
> -		omap_fbdev_free(ddev);
> +	omap_fbdev_free(ddev);
> 
>  	drm_atomic_helper_shutdown(ddev);
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.c
> b/drivers/gpu/drm/omapdrm/omap_fbdev.c index 632ebcf2165f..30ce3d562414
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
> +++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
> @@ -242,7 +242,7 @@ static struct drm_fb_helper *get_fb(struct fb_info *fbi)
> }
> 
>  /* initialize fbdev helper */
> -struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
> +void omap_fbdev_init(struct drm_device *dev)
>  {
>  	struct omap_drm_private *priv = dev->dev_private;
>  	struct omap_fbdev *fbdev = NULL;
> @@ -275,7 +275,7 @@ struct drm_fb_helper *omap_fbdev_init(struct drm_device
> *dev)
> 
>  	priv->fbdev = helper;
> 
> -	return helper;
> +	return;
> 
>  fini:
>  	drm_fb_helper_fini(helper);
> @@ -283,9 +283,6 @@ struct drm_fb_helper *omap_fbdev_init(struct drm_device
> *dev) kfree(fbdev);
> 
>  	dev_warn(dev->dev, "omap_fbdev_init failed\n");

While at it I'd remove the error message when drm_fb_helper_init() fails, it 
duplicates this one.

> -	/* well, limp along without an fbdev.. maybe X11 will work? */
> -
> -	return NULL;
>  }
> 
>  void omap_fbdev_free(struct drm_device *dev)
> @@ -296,6 +293,9 @@ void omap_fbdev_free(struct drm_device *dev)
> 
>  	DBG();
> 
> +	if (!priv->fbdev)
> +		return;
> +

I'd either write this as if (!helper) and replace the other occurrences of 
priv->fbdev below, or replace helper with priv->fbdev in the whole function.

>  	drm_fb_helper_unregister_fbi(helper);
> 
>  	drm_fb_helper_fini(helper);
> diff --git a/drivers/gpu/drm/omapdrm/omap_fbdev.h
> b/drivers/gpu/drm/omapdrm/omap_fbdev.h index 1f5ba0996a1a..3bd6ea661a18
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_fbdev.h
> +++ b/drivers/gpu/drm/omapdrm/omap_fbdev.h
> @@ -24,12 +24,11 @@ struct drm_device;
>  struct drm_fb_helper;
> 
>  #ifdef CONFIG_DRM_FBDEV_EMULATION
> -struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev);
> +void omap_fbdev_init(struct drm_device *dev);
>  void omap_fbdev_free(struct drm_device *dev);
>  #else
> -static inline struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
> +static inline void omap_fbdev_init(struct drm_device *dev)
>  {
> -	return NULL;
>  }
>  static inline void omap_fbdev_free(struct drm_device *dev)
>  {

-- 
Regards,

Laurent Pinchart

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