[PATCH RESEND 05/11] ALSA: vsnd: Implement handling of shared buffers

From: Oleksandr Andrushchenko Implement shared buffer handling according to the para-virtualized sound device protocol at xen/interface/io/sndif.h: - manage buffer memory - handle granted references - handle page directories Signed-off-by: Oleksandr

[PATCH RESEND 05/11] ALSA: vsnd: Implement handling of shared buffers

From: Oleksandr Andrushchenko Implement shared buffer handling according to the para-virtualized sound device protocol at xen/interface/io/sndif.h: - manage buffer memory - handle granted references - handle page directories Signed-off-by: Oleksandr Andrushchenko --- sound/drivers/xen-front.c