The recently merged 228cf793 looks a bit hackish while it is not.
The change was quite simple. In a virtualized environment the
patch unhacks old kludge introduced for old broken AC97 hardware.

This patch adds proper comment to "unkludge" code.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NKonstantin Ozerkov <kozerkov@parallels.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>