drm/drv: Hold ref on parent device during drm_device lifetime
commit 56be6503 upstream. This makes it safe to access drm_device->dev after the parent device has been removed/unplugged. Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190225144232.20761-2-noralf@tronnes.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
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