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drm: Avoid NULL dereference of drm_device.dev 

For a virtual device, drm_device.dev is NULL, so becareful not to
dereference it unconditionally in core code such as drm_dev_register().

Fixes: 75f6dfe3e6 ("drm: Deduplicate driver initialization message")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161230141639.10487-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-12-30 14:16:39 +00:00 committed by Daniel Vetter
parent 824387b2f6
commit 6098909cf2
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/drm_drv.c
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@ -762,7 +762,8 @@ int drm_dev_register(struct drm_device *dev, unsigned long flags)
DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
driver->name, driver->major, driver->minor,
driver->patchlevel, driver->date, dev_name(dev->dev),
driver->patchlevel, driver->date,
dev->dev ? dev_name(dev->dev) : "virtual device",
dev->primary->index);
goto out_unlock;