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Merge tag 'drm-misc-next-fixes-2016-12-10' of git://anongit.freedesktop.org/git/drm-misc into drm-next 

single fix for backwards compat.

* tag 'drm-misc-next-fixes-2016-12-10' of git://anongit.freedesktop.org/git/drm-misc:
  drm: Add fake controlD* symlinks for backwards compat
This commit is contained in:
Dave Airlie 2016-12-13 14:24:25 +10:00
parent 2601a15d5d 6449b088dd
commit 8a5c61f4ff
1 changed files with 62 additions and 0 deletions
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62
drivers/gpu/drm/drm_drv.c
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@ -647,6 +647,62 @@ void drm_dev_unref(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_dev_unref);
static int create_compat_control_link(struct drm_device *dev)
{
struct drm_minor *minor;
char *name;
int ret;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return 0;
minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
if (!minor)
return 0;
/*
* Some existing userspace out there uses the existing of the controlD*
* sysfs files to figure out whether it's a modeset driver. It only does
* readdir, hence a symlink is sufficient (and the least confusing
* option). Otherwise controlD* is entirely unused.
*
* Old controlD chardev have been allocated in the range
* 64-127.
*/
name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
if (!name)
return -ENOMEM;
ret = sysfs_create_link(minor->kdev->kobj.parent,
&minor->kdev->kobj,
name);
kfree(name);
return ret;
}
static void remove_compat_control_link(struct drm_device *dev)
{
struct drm_minor *minor;
char *name;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return;
minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
if (!minor)
return;
name = kasprintf(GFP_KERNEL, "controlD%d", minor->index);
if (!name)
return;
sysfs_remove_link(minor->kdev->kobj.parent, name);
kfree(name);
}
/**
* drm_dev_register - Register DRM device
* @dev: Device to register
@ -685,6 +741,10 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
if (ret)
goto err_minors;
ret = create_compat_control_link(dev);
if (ret)
goto err_minors;
if (dev->driver->load) {
ret = dev->driver->load(dev, flags);
if (ret)
@ -698,6 +758,7 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
goto out_unlock;
err_minors:
remove_compat_control_link(dev);
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
drm_minor_unregister(dev, DRM_MINOR_RENDER);
drm_minor_unregister(dev, DRM_MINOR_CONTROL);
@ -738,6 +799,7 @@ void drm_dev_unregister(struct drm_device *dev)
list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
drm_legacy_rmmap(dev, r_list->map);
remove_compat_control_link(dev);
drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
drm_minor_unregister(dev, DRM_MINOR_RENDER);
drm_minor_unregister(dev, DRM_MINOR_CONTROL);