drm: make sysfs device always available for minors
For each minor we allocate a sysfs device as minor->kdev. Currently, this
is allocated and registered in drm_minor_register(). This makes it
impossible to add sysfs-attributes to the device before it is registered.
Therefore, they are not added atomically, nor can we move device_add()
*after* ->load() is called.
This patch makes minor->kdev available early, but only adds the device
during minor-registration. Note that the registration is still called
before ->load() as debugfs needs to be split, too. This will be fixed in
follow-ups.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 7827dad..ab1a5f6 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -493,72 +493,56 @@
}
/**
- * drm_sysfs_device_add - adds a class device to sysfs for a character driver
- * @dev: DRM device to be added
- * @head: DRM head in question
+ * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor
+ * @minor: minor to allocate sysfs device for
*
- * Add a DRM device to the DRM's device model class. We use @dev's PCI device
- * as the parent for the Linux device, and make sure it has a file containing
- * the driver we're using (for userspace compatibility).
+ * This allocates a new sysfs device for @minor and returns it. The device is
+ * not registered nor linked. The caller has to use device_add() and
+ * device_del() to register and unregister it.
+ *
+ * Note that dev_get_drvdata() on the new device will return the minor.
+ * However, the device does not hold a ref-count to the minor nor to the
+ * underlying drm_device. This is unproblematic as long as you access the
+ * private data only in sysfs callbacks. device_del() disables those
+ * synchronously, so they cannot be called after you cleanup a minor.
*/
-int drm_sysfs_device_add(struct drm_minor *minor)
+struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
{
- char *minor_str;
+ const char *minor_str;
+ struct device *kdev;
int r;
if (minor->type == DRM_MINOR_CONTROL)
minor_str = "controlD%d";
- else if (minor->type == DRM_MINOR_RENDER)
- minor_str = "renderD%d";
- else
- minor_str = "card%d";
+ else if (minor->type == DRM_MINOR_RENDER)
+ minor_str = "renderD%d";
+ else
+ minor_str = "card%d";
- minor->kdev = kzalloc(sizeof(*minor->kdev), GFP_KERNEL);
- if (!minor->kdev) {
- r = -ENOMEM;
- goto error;
- }
+ kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
+ if (!kdev)
+ return ERR_PTR(-ENOMEM);
- device_initialize(minor->kdev);
- minor->kdev->devt = MKDEV(DRM_MAJOR, minor->index);
- minor->kdev->class = drm_class;
- minor->kdev->type = &drm_sysfs_device_minor;
- minor->kdev->parent = minor->dev->dev;
- minor->kdev->release = drm_sysfs_release;
- dev_set_drvdata(minor->kdev, minor);
+ device_initialize(kdev);
+ kdev->devt = MKDEV(DRM_MAJOR, minor->index);
+ kdev->class = drm_class;
+ kdev->type = &drm_sysfs_device_minor;
+ kdev->parent = minor->dev->dev;
+ kdev->release = drm_sysfs_release;
+ dev_set_drvdata(kdev, minor);
- r = dev_set_name(minor->kdev, minor_str, minor->index);
+ r = dev_set_name(kdev, minor_str, minor->index);
if (r < 0)
- goto error;
+ goto err_free;
- r = device_add(minor->kdev);
- if (r < 0)
- goto error;
+ return kdev;
- return 0;
-
-error:
- DRM_ERROR("device create failed %d\n", r);
- put_device(minor->kdev);
- return r;
+err_free:
+ put_device(kdev);
+ return ERR_PTR(r);
}
/**
- * drm_sysfs_device_remove - remove DRM device
- * @dev: DRM device to remove
- *
- * This call unregisters and cleans up a class device that was created with a
- * call to drm_sysfs_device_add()
- */
-void drm_sysfs_device_remove(struct drm_minor *minor)
-{
- if (minor->kdev)
- device_unregister(minor->kdev);
- minor->kdev = NULL;
-}
-
-
-/**
* drm_class_device_register - Register a struct device in the drm class.
*
* @dev: pointer to struct device to register.