My mother used to offer salatul tasbeeh regularly up until now. I read at some places and even heard from someone that salatul tasbeeh is an innovation, hence I asked my mother not to. Now again while reading through another thread here on SF about nafl salat in ramadan, the article included salatul tasbih as a recommended nafl salat. Now I am very confused. Is it authentic? Are there any saheeh hadiths supporting it?