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-rw-r--r--sound/firewire/amdtp.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 09f70ee..046007d 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -228,11 +228,15 @@ static unsigned int calculate_syt(struct amdtp_out_stream *s,
syt_offset = s->last_syt_offset - TICKS_PER_CYCLE;
s->last_syt_offset = syt_offset;
- syt_offset += TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
- syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12;
- syt += syt_offset % TICKS_PER_CYCLE;
+ if (syt_offset < TICKS_PER_CYCLE) {
+ syt_offset += TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
+ syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12;
+ syt += syt_offset % TICKS_PER_CYCLE;
- return syt & 0xffff;
+ return syt & 0xffff;
+ } else {
+ return 0xffff; /* no info */
+ }
}
static void amdtp_write_s32(struct amdtp_out_stream *s,
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