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Message-ID: <fc644426-67db-7128-5f73-8630373ab0e8@suse.de>
Date: Tue, 1 Dec 2020 13:17:15 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Tian Tao <tiantao6@...ilicon.com>, airlied@...ux.ie,
daniel@...ll.ch, kraxel@...hat.com, alexander.deucher@....com,
tglx@...utronix.de, dri-devel@...ts.freedesktop.org,
xinliang.liu@...aro.org, maarten.lankhorst@...ux.intel.com,
mripard@...nel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH drm/hisilicon v2 1/4] drm/hisilicon: Assgin local variable
to drm_device
Hi
Am 01.12.20 um 12:55 schrieb Tian Tao:
> Assign local variable to struct drm_device *dev because they are
> used multiple times within a function.
>
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> ---
> drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c | 2 +-
> drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 30 ++++++++++++------------
> drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h | 2 +-
> drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 2 +-
> drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c | 8 ++++---
> 5 files changed, 23 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> index ea962ac..096eea9 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_de.c
> @@ -499,7 +499,7 @@ static const struct drm_crtc_helper_funcs hibmc_crtc_helper_funcs = {
>
> int hibmc_de_init(struct hibmc_drm_private *priv)
> {
> - struct drm_device *dev = priv->dev;
> + struct drm_device *dev = &priv->dev;
> struct drm_crtc *crtc = &priv->crtc;
> struct drm_plane *plane = &priv->primary_plane;
> int ret;
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index d845657..dd9fadc 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -79,31 +79,32 @@ static const struct dev_pm_ops hibmc_pm_ops = {
>
> static int hibmc_kms_init(struct hibmc_drm_private *priv)
> {
> + struct drm_device *dev = &priv->dev;
> int ret;
>
> - drm_mode_config_init(priv->dev);
> + drm_mode_config_init(dev);
> priv->mode_config_initialized = true;
>
> - priv->dev->mode_config.min_width = 0;
> - priv->dev->mode_config.min_height = 0;
> - priv->dev->mode_config.max_width = 1920;
> - priv->dev->mode_config.max_height = 1200;
> + dev->mode_config.min_width = 0;
> + dev->mode_config.min_height = 0;
> + dev->mode_config.max_width = 1920;
> + dev->mode_config.max_height = 1200;
>
> - priv->dev->mode_config.fb_base = priv->fb_base;
> - priv->dev->mode_config.preferred_depth = 32;
> - priv->dev->mode_config.prefer_shadow = 1;
> + dev->mode_config.fb_base = priv->fb_base;
> + dev->mode_config.preferred_depth = 32;
> + dev->mode_config.prefer_shadow = 1;
>
> - priv->dev->mode_config.funcs = (void *)&hibmc_mode_funcs;
> + dev->mode_config.funcs = (void *)&hibmc_mode_funcs;
>
> ret = hibmc_de_init(priv);
> if (ret) {
> - drm_err(priv->dev, "failed to init de: %d\n", ret);
> + drm_err(dev, "failed to init de: %d\n", ret);
> return ret;
> }
>
> ret = hibmc_vdac_init(priv);
> if (ret) {
> - drm_err(priv->dev, "failed to init vdac: %d\n", ret);
> + drm_err(dev, "failed to init vdac: %d\n", ret);
> return ret;
> }
>
> @@ -113,7 +114,7 @@ static int hibmc_kms_init(struct hibmc_drm_private *priv)
> static void hibmc_kms_fini(struct hibmc_drm_private *priv)
> {
> if (priv->mode_config_initialized) {
> - drm_mode_config_cleanup(priv->dev);
> + drm_mode_config_cleanup(&priv->dev);
> priv->mode_config_initialized = false;
> }
> }
> @@ -202,7 +203,7 @@ static void hibmc_hw_config(struct hibmc_drm_private *priv)
>
> static int hibmc_hw_map(struct hibmc_drm_private *priv)
> {
> - struct drm_device *dev = priv->dev;
> + struct drm_device *dev = &priv->dev;
> struct pci_dev *pdev = dev->pdev;
> resource_size_t addr, size, ioaddr, iosize;
>
> @@ -258,7 +259,7 @@ static int hibmc_unload(struct drm_device *dev)
>
> static int hibmc_load(struct drm_device *dev)
> {
> - struct hibmc_drm_private *priv;
> + struct hibmc_drm_private *priv = to_hibmc_drm_private(dev);
> int ret;
>
> priv = drmm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> @@ -267,7 +268,6 @@ static int hibmc_load(struct drm_device *dev)
> return -ENOMEM;
> }
> dev->dev_private = priv;
> - priv->dev = dev;
I'm sure this either does not build or does not work. There's a call to
drm_dev_alloc(), which initialized the DRM device. You need to assign
the returned device here. The embedding of dev only work after you
switched to devm_drm_dev_alloc() in the next patch.
For the patch at hand, just keep struct hibmc_drm_private.dev as a
pointer and you should be fine.
Best regards
Thomas
>
> ret = hibmc_hw_init(priv);
> if (ret)
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> index f310a83..e35353a 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> @@ -37,7 +37,7 @@ struct hibmc_drm_private {
> resource_size_t fb_size;
>
> /* drm */
> - struct drm_device *dev;
> + struct drm_device dev;
> struct drm_plane primary_plane;
> struct drm_crtc crtc;
> struct drm_encoder encoder;
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> index 74e26c2..d35548d 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> @@ -96,7 +96,7 @@ static const struct drm_encoder_funcs hibmc_encoder_funcs = {
>
> int hibmc_vdac_init(struct hibmc_drm_private *priv)
> {
> - struct drm_device *dev = priv->dev;
> + struct drm_device *dev = &priv->dev;
> struct hibmc_connector *hibmc_connector = &priv->connector;
> struct drm_encoder *encoder = &priv->encoder;
> struct drm_connector *connector = &hibmc_connector->base;
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> index 602ece1..e84fb81 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> @@ -25,7 +25,7 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc)
> {
> struct drm_vram_mm *vmm;
> int ret;
> - struct drm_device *dev = hibmc->dev;
> + struct drm_device *dev = &hibmc->dev;
>
> vmm = drm_vram_helper_alloc_mm(dev,
> pci_resource_start(dev->pdev, 0),
> @@ -41,10 +41,12 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc)
>
> void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
> {
> - if (!hibmc->dev->vram_mm)
> + struct drm_device *dev = &hibmc->dev;
> +
> + if (!dev->vram_mm)
> return;
>
> - drm_vram_helper_release_mm(hibmc->dev);
> + drm_vram_helper_release_mm(dev);
> }
>
> int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer
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