Hello.

     Retain the write-only OD bit from being clobbered by coherency_setup().

WBR, Sergei

PS: Looks like this patch is stuck uncommitted since December, while it's a
serious issue causing the kernel lockups.

Signed-off-by: Konstantin Baidarov <kbaidarov@ru.mvista.com>
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>