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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2019-07-07 15:07:54 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-07-08 15:50:37 +0300 |
| commit | 7fbf909668d69d7ab4428f6f55cb53fe4451b9b1 (patch) | |
| tree | e5e9ec91cc41cc29aee6199bae32f81a2041107b /sound/firewire/amdtp-stream.c | |
| parent | 0ebf3ceb83648f9d149220bf0c6986ddce11361a (diff) | |
| download | linux-7fbf909668d69d7ab4428f6f55cb53fe4451b9b1.tar.xz | |
ALSA: firewire-lib/fireface: fix initial value of data block counter for IR context with CIP_NO_HEADER
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_NO_HEADER is used (i.e. for ALSA fireface driver),
the initial value is used for tracepoints event. 0x00 should be
for the event when the initial value is UINT_MAX because isochronous
packets with CIP_NO_HEADER option has no field for data block count.
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 <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/amdtp-stream.c')
| -rw-r--r-- | sound/firewire/amdtp-stream.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 427624009de9..b60cf25ee5a8 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -646,8 +646,12 @@ static int parse_ir_ctx_header(struct amdtp_stream *s, unsigned int cycle, err = 0; *data_blocks = *payload_length / sizeof(__be32) / s->data_block_quadlets; - *dbc = s->data_block_counter; *syt = 0; + + if (s->data_block_counter != UINT_MAX) + *dbc = s->data_block_counter; + else + *dbc = 0; } if (err >= 0 && s->flags & CIP_DBC_IS_END_EVENT) |