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ALSA: firewire-tascam: fix loop condition with some readable variables

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In transactions for MIDI messages, the first byte is used for label and
the rest is for MIDI bytes. In current code, these are handled correctly,
while there's a small mistake for loop condition to include meaningless
statement.

This commit adds two local variables for them and improve the loop
condition.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-10-20 23:46:58 +09:00 committed by Takashi Iwai
parent b7ab614f30
commit 123990e930
1 changed files with 20 additions and 15 deletions
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35
sound/firewire/tascam/tascam-transaction.c
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@ -63,17 +63,22 @@ static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
struct snd_tscm *tscm = substream->rmidi->private_data;
unsigned int port = substream->number;
int i, len, consume;
u8 *label, *msg;
u8 status;
consume = snd_rawmidi_transmit_peek(substream, buf + 1, 3);
/* The first byte is used for label, the rest for MIDI bytes. */
label = buf;
msg = buf + 1;
consume = snd_rawmidi_transmit_peek(substream, msg, 3);
if (consume == 0)
return 0;
/* On exclusive message. */
if (tscm->on_sysex[port]) {
/* Seek the end of exclusives. */
for (i = 1; i < 4 || i < consume; ++i) {
if (buf[i] == 0xf7) {
for (i = 0; i < consume; ++i) {
if (msg[i] == 0xf7) {
tscm->on_sysex[port] = false;
break;
}
@ -81,27 +86,27 @@ static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
/* At the end of exclusive message, use label 0x07. */
if (!tscm->on_sysex[port]) {
consume = i;
buf[0] = (port << 4) | 0x07;
consume = i + 1;
*label = (port << 4) | 0x07;
/* During exclusive message, use label 0x04. */
} else if (consume == 3) {
buf[0] = (port << 4) | 0x04;
*label = (port << 4) | 0x04;
/* We need to fill whole 3 bytes. Go to next change. */
} else {
consume = 0;
}
} else {
/* The beginning of exclusives. */
if (buf[1] == 0xf0) {
if (msg[0] == 0xf0) {
/* Transfer it in next chance in another condition. */
tscm->on_sysex[port] = true;
return 0;
} else {
/* On running-status. */
if ((buf[1] & 0x80) != 0x80)
if ((msg[0] & 0x80) != 0x80)
status = tscm->running_status[port];
else
status = buf[1];
status = msg[0];
/* Calculate consume bytes. */
len = calculate_message_bytes(status);
@ -109,13 +114,13 @@ static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
return 0;
/* On running-status. */
if ((buf[1] & 0x80) != 0x80) {
buf[3] = buf[2];
buf[2] = buf[1];
buf[1] = tscm->running_status[port];
if ((msg[0] & 0x80) != 0x80) {
msg[2] = msg[1];
msg[1] = msg[0];
msg[0] = tscm->running_status[port];
consume--;
} else {
tscm->running_status[port] = buf[1];
tscm->running_status[port] = msg[0];
}
/* Confirm length. */
@ -125,7 +130,7 @@ static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
consume = len;
}
buf[0] = (port << 4) | (buf[1] >> 4);
*label = (port << 4) | (msg[0] >> 4);
}
return consume;