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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2021-05-13 21:56:51 +0900
committerTakashi Iwai <tiwai@suse.de>2021-05-14 09:41:16 +0200
commit1be4f21d9984fa9835fae5411a29465dc5aece6f (patch)
tree9b9427fc55b7659dd449e000bca5ca60b4da679c /sound
parent395f41e2cdac63e7581fb9574e5ac0f02556e34a (diff)
ALSA: firewire-lib: fix calculation for size of IR context payload
The quadlets for CIP header is handled as a part of IR context header, thus it doesn't join in IR context payload. However current calculation includes the quadlets in IR context payload. Cc: <stable@vger.kernel.org> Fixes: f11453c7cc01 ("ALSA: firewire-lib: use 16 bytes IR context header to separate CIP header") Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210513125652.110249-5-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/firewire/amdtp-stream.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index b53971bf4b90..73aff017dc9a 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -1071,23 +1071,22 @@ static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
s->data_block_counter = 0;
}
- /* initialize packet buffer */
+ // initialize packet buffer.
+ max_ctx_payload_size = amdtp_stream_get_max_payload(s);
if (s->direction == AMDTP_IN_STREAM) {
dir = DMA_FROM_DEVICE;
type = FW_ISO_CONTEXT_RECEIVE;
- if (!(s->flags & CIP_NO_HEADER))
+ if (!(s->flags & CIP_NO_HEADER)) {
+ max_ctx_payload_size -= 8;
ctx_header_size = IR_CTX_HEADER_SIZE_CIP;
- else
+ } else {
ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP;
-
- max_ctx_payload_size = amdtp_stream_get_max_payload(s) -
- ctx_header_size;
+ }
} else {
dir = DMA_TO_DEVICE;
type = FW_ISO_CONTEXT_TRANSMIT;
ctx_header_size = 0; // No effect for IT context.
- max_ctx_payload_size = amdtp_stream_get_max_payload(s);
if (!(s->flags & CIP_NO_HEADER))
max_ctx_payload_size -= IT_PKT_HEADER_SIZE_CIP;
}

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