b255c53ab5e39b37fd4d484ea3dc39ab456
author Jaroslav Kysela <perex@perex.cz> 1262708374 +0100
committer Jaroslav Kysela <perex@perex.cz> 1262875658 +0100

ALSA: pcm_lib - cleanup & merge hw_ptr update functions

Do general cleanup in snd_pcm_update_hw_ptr*() routines and merge them.
The main change is hw_ptr_interrupt variable removal to simplify code
logic. This variable can be computed directly from hw_ptr.

Ensure that updated hw_ptr is not lower than previous one (it was possible
with old code in some obscure situations when interrupt was delayed or
the lowlevel driver returns wrong ring buffer position value).

Signed-off-by: Jaroslav Kysela <perex@perex.cz>