The comment for fcp_avc_transaction() describes it doesn't support this type of operation. But it was already supported by this commit.
00a7bb81c20f3e81711e28e0f6c08cee8fd18514 ALSA: firewire-lib: Add support for deferred transaction
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/fcp.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/sound/firewire/fcp.c b/sound/firewire/fcp.c index d48e326..0619597 100644 --- a/sound/firewire/fcp.c +++ b/sound/firewire/fcp.c @@ -218,8 +218,6 @@ struct fcp_transaction { * * @command and @response can point to the same buffer. * - * Asynchronous operation (INTERIM, NOTIFY) is not supported at the moment. - * * Returns the actual size of the response frame, or a negative error code. */ int fcp_avc_transaction(struct fw_unit *unit,