diff mbox series

[56/59] drm/aspeed: Use managed drmm_mode_config_cleanup

Message ID 20200415074034.175360-57-daniel.vetter@ffwll.ch
State New
Headers show
Series None | expand

Commit Message

Daniel Vetter April 15, 2020, 7:40 a.m. UTC
Since aspeed doesn't use devm_kzalloc anymore we can use the managed
mode config cleanup.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Andrew Jeffery <andrew@aj.id.au>
Cc: linux-aspeed@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

Comments

Sam Ravnborg April 24, 2020, 6:10 p.m. UTC | #1
On Wed, Apr 15, 2020 at 09:40:31AM +0200, Daniel Vetter wrote:
> Since aspeed doesn't use devm_kzalloc anymore we can use the managed
> mode config cleanup.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Joel Stanley <joel@jms.id.au>
> Cc: Andrew Jeffery <andrew@aj.id.au>
> Cc: linux-aspeed@lists.ozlabs.org
> Cc: linux-arm-kernel@lists.infradead.org

Hmm, the helper function makes no sense, maybe embed it?

One Q below. Whith Q addressed:
Acked-by: Sam Ravnborg <sam@ravnborg.org>

> ---
>  drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> index 6b27242b9ee3..6e464b84a256 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> @@ -63,15 +63,15 @@ static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
>  	.atomic_commit		= drm_atomic_helper_commit,
>  };
>  
> -static void aspeed_gfx_setup_mode_config(struct drm_device *drm)
> +static int aspeed_gfx_setup_mode_config(struct drm_device *drm)
>  {
> -	drm_mode_config_init(drm);
> -
>  	drm->mode_config.min_width = 0;
>  	drm->mode_config.min_height = 0;
>  	drm->mode_config.max_width = 800;
>  	drm->mode_config.max_height = 600;
>  	drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;
> +
> +	return drmm_mode_config_init(drm);

I do not see anything that documents that it is OK to init min/max
width/heigh not funcs before drmm_mode_config_init() is called.
Maybe drmm_mode_config_init() gain an memset(drm->mode_config),
and we loose all the assingments from before the call to init().

Also most (all?) other users of drmm_mode_config_init()
set them after the call to drmm_mode_config_init().
So re-order here and then embed while you are touching the code again.

	Sam

>  }
>  
>  static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
> @@ -144,7 +144,9 @@ static int aspeed_gfx_load(struct drm_device *drm)
>  	writel(0, priv->base + CRT_CTRL1);
>  	writel(0, priv->base + CRT_CTRL2);
>  
> -	aspeed_gfx_setup_mode_config(drm);
> +	ret = aspeed_gfx_setup_mode_config(drm);
> +	if (ret < 0)
> +		return ret;
>  
>  	ret = drm_vblank_init(drm, 1);
>  	if (ret < 0) {
> @@ -181,7 +183,6 @@ static int aspeed_gfx_load(struct drm_device *drm)
>  static void aspeed_gfx_unload(struct drm_device *drm)
>  {
>  	drm_kms_helper_poll_fini(drm);
> -	drm_mode_config_cleanup(drm);
>  }
>  
>  DEFINE_DRM_GEM_CMA_FOPS(fops);
> -- 
> 2.25.1
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Daniel Vetter April 28, 2020, 2:12 p.m. UTC | #2
On Fri, Apr 24, 2020 at 08:10:02PM +0200, Sam Ravnborg wrote:
> On Wed, Apr 15, 2020 at 09:40:31AM +0200, Daniel Vetter wrote:
> > Since aspeed doesn't use devm_kzalloc anymore we can use the managed
> > mode config cleanup.
> > 
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > Cc: Joel Stanley <joel@jms.id.au>
> > Cc: Andrew Jeffery <andrew@aj.id.au>
> > Cc: linux-aspeed@lists.ozlabs.org
> > Cc: linux-arm-kernel@lists.infradead.org
> 
> Hmm, the helper function makes no sense, maybe embed it?
> 
> One Q below. Whith Q addressed:
> Acked-by: Sam Ravnborg <sam@ravnborg.org>
> 
> > ---
> >  drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > index 6b27242b9ee3..6e464b84a256 100644
> > --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > @@ -63,15 +63,15 @@ static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
> >  	.atomic_commit		= drm_atomic_helper_commit,
> >  };
> >  
> > -static void aspeed_gfx_setup_mode_config(struct drm_device *drm)
> > +static int aspeed_gfx_setup_mode_config(struct drm_device *drm)
> >  {
> > -	drm_mode_config_init(drm);
> > -
> >  	drm->mode_config.min_width = 0;
> >  	drm->mode_config.min_height = 0;
> >  	drm->mode_config.max_width = 800;
> >  	drm->mode_config.max_height = 600;
> >  	drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;
> > +
> > +	return drmm_mode_config_init(drm);
> 
> I do not see anything that documents that it is OK to init min/max
> width/heigh not funcs before drmm_mode_config_init() is called.
> Maybe drmm_mode_config_init() gain an memset(drm->mode_config),
> and we loose all the assingments from before the call to init().
> 
> Also most (all?) other users of drmm_mode_config_init()
> set them after the call to drmm_mode_config_init().
> So re-order here and then embed while you are touching the code again.

Only reason I've done it like this is that it saves a few lines of diff
compared to other options.

Wrt calling stuff the wrong way round: We pretty much assume throughout
that structures are allocated with kzalloc, none of our _init() functions
in drm have a memset. We'd break the world if we start doing memset() in
random _init() functions I think.

Also the main aspeed_gfx_load() function is quite long already, smashing
more random stuff in there won't help it's readability.

Anyway I don't care, if you insist I'm happy to repaint this in whatever
color choice you deem best :-)

Cheers, Daniel

> 
> 	Sam
> 
> >  }
> >  
> >  static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
> > @@ -144,7 +144,9 @@ static int aspeed_gfx_load(struct drm_device *drm)
> >  	writel(0, priv->base + CRT_CTRL1);
> >  	writel(0, priv->base + CRT_CTRL2);
> >  
> > -	aspeed_gfx_setup_mode_config(drm);
> > +	ret = aspeed_gfx_setup_mode_config(drm);
> > +	if (ret < 0)
> > +		return ret;
> >  
> >  	ret = drm_vblank_init(drm, 1);
> >  	if (ret < 0) {
> > @@ -181,7 +183,6 @@ static int aspeed_gfx_load(struct drm_device *drm)
> >  static void aspeed_gfx_unload(struct drm_device *drm)
> >  {
> >  	drm_kms_helper_poll_fini(drm);
> > -	drm_mode_config_cleanup(drm);
> >  }
> >  
> >  DEFINE_DRM_GEM_CMA_FOPS(fops);
> > -- 
> > 2.25.1
> > 
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
Sam Ravnborg April 28, 2020, 5:03 p.m. UTC | #3
On Tue, Apr 28, 2020 at 04:12:21PM +0200, Daniel Vetter wrote:
> On Fri, Apr 24, 2020 at 08:10:02PM +0200, Sam Ravnborg wrote:
> > On Wed, Apr 15, 2020 at 09:40:31AM +0200, Daniel Vetter wrote:
> > > Since aspeed doesn't use devm_kzalloc anymore we can use the managed
> > > mode config cleanup.
> > > 
> > > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > > Cc: Joel Stanley <joel@jms.id.au>
> > > Cc: Andrew Jeffery <andrew@aj.id.au>
> > > Cc: linux-aspeed@lists.ozlabs.org
> > > Cc: linux-arm-kernel@lists.infradead.org
> > 
> > Hmm, the helper function makes no sense, maybe embed it?
> > 
> > One Q below. Whith Q addressed:
> > Acked-by: Sam Ravnborg <sam@ravnborg.org>
> > 
> > > ---
> > >  drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 11 ++++++-----
> > >  1 file changed, 6 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > > index 6b27242b9ee3..6e464b84a256 100644
> > > --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > > +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > > @@ -63,15 +63,15 @@ static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
> > >  	.atomic_commit		= drm_atomic_helper_commit,
> > >  };
> > >  
> > > -static void aspeed_gfx_setup_mode_config(struct drm_device *drm)
> > > +static int aspeed_gfx_setup_mode_config(struct drm_device *drm)
> > >  {
> > > -	drm_mode_config_init(drm);
> > > -
> > >  	drm->mode_config.min_width = 0;
> > >  	drm->mode_config.min_height = 0;
> > >  	drm->mode_config.max_width = 800;
> > >  	drm->mode_config.max_height = 600;
> > >  	drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;
> > > +
> > > +	return drmm_mode_config_init(drm);
> > 
> > I do not see anything that documents that it is OK to init min/max
> > width/heigh not funcs before drmm_mode_config_init() is called.
> > Maybe drmm_mode_config_init() gain an memset(drm->mode_config),
> > and we loose all the assingments from before the call to init().
> > 
> > Also most (all?) other users of drmm_mode_config_init()
> > set them after the call to drmm_mode_config_init().
> > So re-order here and then embed while you are touching the code again.
> 
> Only reason I've done it like this is that it saves a few lines of diff
> compared to other options.
> 
> Wrt calling stuff the wrong way round: We pretty much assume throughout
> that structures are allocated with kzalloc, none of our _init() functions
> in drm have a memset. We'd break the world if we start doing memset() in
> random _init() functions I think.
> 
> Also the main aspeed_gfx_load() function is quite long already, smashing
> more random stuff in there won't help it's readability.
> 
> Anyway I don't care, if you insist I'm happy to repaint this in whatever
> color choice you deem best :-)

From the principle of least suprises, you should at least call init and
then set min_width and friends.
This is easy to do in the helper, so easy to avoid the inlining I
suggested.

	Sam
diff mbox series

Patch

diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
index 6b27242b9ee3..6e464b84a256 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
@@ -63,15 +63,15 @@  static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
 	.atomic_commit		= drm_atomic_helper_commit,
 };
 
-static void aspeed_gfx_setup_mode_config(struct drm_device *drm)
+static int aspeed_gfx_setup_mode_config(struct drm_device *drm)
 {
-	drm_mode_config_init(drm);
-
 	drm->mode_config.min_width = 0;
 	drm->mode_config.min_height = 0;
 	drm->mode_config.max_width = 800;
 	drm->mode_config.max_height = 600;
 	drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;
+
+	return drmm_mode_config_init(drm);
 }
 
 static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
@@ -144,7 +144,9 @@  static int aspeed_gfx_load(struct drm_device *drm)
 	writel(0, priv->base + CRT_CTRL1);
 	writel(0, priv->base + CRT_CTRL2);
 
-	aspeed_gfx_setup_mode_config(drm);
+	ret = aspeed_gfx_setup_mode_config(drm);
+	if (ret < 0)
+		return ret;
 
 	ret = drm_vblank_init(drm, 1);
 	if (ret < 0) {
@@ -181,7 +183,6 @@  static int aspeed_gfx_load(struct drm_device *drm)
 static void aspeed_gfx_unload(struct drm_device *drm)
 {
 	drm_kms_helper_poll_fini(drm);
-	drm_mode_config_cleanup(drm);
 }
 
 DEFINE_DRM_GEM_CMA_FOPS(fops);