@@ -93,8 +93,10 @@ static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
*label = (port << 4) | 0x04;
/* We need to fill whole 3 bytes. Go to next change. */
} else {
- consume = 0;
+ return 0;
}
+
+ len = consume;
} else {
/* The beginning of exclusives. */
if (msg[0] == 0xf0) {
@@ -115,24 +117,30 @@ static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
/* On running-status. */
if ((msg[0] & 0x80) != 0x80) {
+ /* Enough MIDI bytes were not retrieved. */
+ if (consume < len - 1)
+ return 0;
+ consume = len - 1;
+
msg[2] = msg[1];
msg[1] = msg[0];
msg[0] = tscm->running_status[port];
- consume--;
} else {
+ /* Enough MIDI bytes were not retrieved. */
+ if (consume < len)
+ return 0;
+ consume = len;
+
tscm->running_status[port] = msg[0];
}
-
- /* Confirm length. */
- if (consume < len)
- return 0;
- if (consume > len)
- consume = len;
}
*label = (port << 4) | (msg[0] >> 4);
}
+ if (len > 0 && len < 3)
+ memset(msg + len, 0, 3 - len);
+
return consume;
}
When MIDI buffer stores two or more MIDI messages, TASCAM driver transfers asynchronous transactions including one MIDI message and extra bytes from second MIDI message. This commit fixes this bug by clearing needless bytes in the buffer. The consumed bytes are already calculated correctly, thus the sequence of transactions is already correct. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> --- sound/firewire/tascam/tascam-transaction.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-)