Comment # 4 on bug 1012594 from Takashi Iwai

So, as a summary:
- A few PCM bugs have been fixed:
  * Stall of dmix and others in a wrong PCM state
  * Refactoring of PCM locking scheme
  * SHM initialization race fix
  * plug PCM memory leaks
  * Improvement of dshare/dmix delay calculation
  * Fix endless dshare draining
  * Fix semaphore discard race fix of direct plugins
- UCM fixes and updates for DB410c and skylake-r5286
- Mixer code cleanup not to install bogus plugin codes
- Documentation fixes / updates