From 4ece7f6fd830d71bbb185434bf081b1f47701a67 Mon Sep 17 00:00:00 2001 From: Takashi Sakamoto Date: Sun, 7 Jul 2019 21:07:55 +0900 Subject: ALSA: firewire-lib: fix initial value of data block count for IR context without CIP_DBC_IS_END_EVENT For IR context, ALSA IEC 61883-1/6 engine uses initial value of data block counter as UINT_MAX, to detect first isochronous packet in the middle of packet streaming. At present, when CIP_DBC_IS_END_EVENT is not used (i.e. for drivers except for ALSA fireworks driver), the initial value is used as is for tracepoints event. However, the engine can detect the value of dbc field in the payload of first isochronous packet and the value should be assigned to the event. This commit fixes the bug. Fixes: 76864868dbab ("ALSA: firewire-lib: cache next data_block_counter after probing tracepoints event for IR context") Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai --- sound/firewire/amdtp-stream.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'sound') diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index b60cf25ee5a8..3d410057eaa4 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -654,8 +654,10 @@ static int parse_ir_ctx_header(struct amdtp_stream *s, unsigned int cycle, *dbc = 0; } - if (err >= 0 && s->flags & CIP_DBC_IS_END_EVENT) - s->data_block_counter = *dbc; + if (err < 0) + return err; + + s->data_block_counter = *dbc; trace_amdtp_packet(s, cycle, cip_header, *payload_length, *data_blocks, index); -- cgit v1.2.3