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Commit d6ed682e authored by Daniel Vetter's avatar Daniel Vetter
Browse files

drm: Refactor drop/set master code a bit 



File open/set_maseter ioctl and file close/drop_master ioctl share the
same master handling code. Extract it.

Note that vmwgfx's master_set callback needs to know whether the
master is a new one or has been used already, so thread this through.
On the close/drop side a similar parameter existed, but wasnt used.
Drop it to simplify the flow.

v2: Try to make it not leak so much (Emil).

v3: Send out the right version ...

Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarEmil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466511638-9885-1-git-send-email-daniel.vetter@ffwll.ch
parent a3257256

drivers/gpu/drm/drm_auth.c

+42 −38
Original line number Diff line number Diff line
@@ -110,6 +110,24 @@ static struct drm_master *drm_master_create(struct drm_device *dev) 
	return master;

}



static int drm_set_master(struct drm_device *dev, struct drm_file *fpriv,

			  bool new_master)

{

	int ret = 0;



	dev->master = drm_master_get(fpriv->master);

	fpriv->is_master = 1;

	if (dev->driver->master_set) {

		ret = dev->driver->master_set(dev, fpriv, new_master);

		if (unlikely(ret != 0)) {

			fpriv->is_master = 0;

			drm_master_put(&dev->master);

		}

	}



	return ret;

}



/*

 * drm_new_set_master - Allocate a new master object and become master for the

 * associated master realm.
@@ -127,37 +145,32 @@ static int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv) 


	lockdep_assert_held_once(&dev->master_mutex);



	/* create a new master */

	dev->master = drm_master_create(dev);

	if (!dev->master)

		return -ENOMEM;



	/* take another reference for the copy in the local file priv */

	old_master = fpriv->master;

	fpriv->master = drm_master_get(dev->master);

	fpriv->master = drm_master_create(dev);

	if (!fpriv->master) {

		fpriv->master = old_master;

		return -ENOMEM;

	}



	if (dev->driver->master_create) {

		ret = dev->driver->master_create(dev, fpriv->master);

		if (ret)

			goto out_err;

	}

	if (dev->driver->master_set) {

		ret = dev->driver->master_set(dev, fpriv, true);

	fpriv->allowed_master = 1;

	fpriv->authenticated = 1;



	ret = drm_set_master(dev, fpriv, true);

	if (ret)

		goto out_err;

	}



	fpriv->is_master = 1;

	fpriv->allowed_master = 1;

	fpriv->authenticated = 1;

	if (old_master)

		drm_master_put(&old_master);



	return 0;



out_err:

	/* drop both references and restore old master on failure */

	drm_master_put(&dev->master);

	/* drop references and restore old master on failure */

	drm_master_put(&fpriv->master);

	fpriv->master = old_master;
@@ -188,21 +201,21 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data, 
		goto out_unlock;

	}



	dev->master = drm_master_get(file_priv->master);

	file_priv->is_master = 1;

	if (dev->driver->master_set) {

		ret = dev->driver->master_set(dev, file_priv, false);

		if (unlikely(ret != 0)) {

			file_priv->is_master = 0;

			drm_master_put(&dev->master);

		}

	}



	ret = drm_set_master(dev, file_priv, false);

out_unlock:

	mutex_unlock(&dev->master_mutex);

	return ret;

}



static void drm_drop_master(struct drm_device *dev,

			    struct drm_file *fpriv)

{

	if (dev->driver->master_drop)

		dev->driver->master_drop(dev, fpriv);

	drm_master_put(&dev->master);

	fpriv->is_master = 0;

}



int drm_dropmaster_ioctl(struct drm_device *dev, void *data,

			 struct drm_file *file_priv)

{
@@ -216,11 +229,7 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data, 
		goto out_unlock;



	ret = 0;

	if (dev->driver->master_drop)

		dev->driver->master_drop(dev, file_priv, false);

	drm_master_put(&dev->master);

	file_priv->is_master = 0;



	drm_drop_master(dev, file_priv);

out_unlock:

	mutex_unlock(&dev->master_mutex);

	return ret;
@@ -271,17 +280,12 @@ void drm_master_release(struct drm_file *file_priv) 
		mutex_unlock(&dev->struct_mutex);

	}



	if (dev->master == file_priv->master) {

		/* drop the reference held my the minor */

		if (dev->driver->master_drop)

			dev->driver->master_drop(dev, file_priv, true);

		drm_master_put(&dev->master);

	}

	if (dev->master == file_priv->master)

		drm_drop_master(dev, file_priv);

out:

	/* drop the master reference held by the file priv */

	if (file_priv->master)

		drm_master_put(&file_priv->master);

	file_priv->is_master = 0;

	mutex_unlock(&dev->master_mutex);

}

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

+1 −2
Original line number Diff line number Diff line
@@ -1228,8 +1228,7 @@ static int vmw_master_set(struct drm_device *dev, 
}



static void vmw_master_drop(struct drm_device *dev,

			    struct drm_file *file_priv,

			    bool from_release)

			    struct drm_file *file_priv)

{

	struct vmw_private *dev_priv = vmw_priv(dev);

	struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);

include/drm/drmP.h

+1 −2
Original line number Diff line number Diff line
@@ -573,8 +573,7 @@ struct drm_driver { 


	int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,

			  bool from_open);

	void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv,

			    bool from_release);

	void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);



	int (*debugfs_init)(struct drm_minor *minor);

	void (*debugfs_cleanup)(struct drm_minor *minor);