sound: seq_midi_event: fix decoding of (N)RPN events

When decoding (N)RPN sequencer events into raw MIDI commands, the
extra_decode_xrpn() function had accidentally swapped the MSB and LSB
controller values of both the parameter number and the data value.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/seq/seq_midi_event.c b/sound/core/seq/seq_midi_event.c
index 8284f17..b5d6ea4 100644 (file)
--- a/sound/core/seq/seq_midi_event.c
+++ b/sound/core/seq/seq_midi_event.c
@@ -504,10 +504,10 @@ static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
        if (dev->nostat && count < 12)
                return -ENOMEM;
        cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
        if (dev->nostat && count < 12)
                return -ENOMEM;
        cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);

-       bytes[0] = ev->data.control.param & 0x007f;
-       bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
-       bytes[2] = ev->data.control.value & 0x007f;
-       bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
+       bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
+       bytes[1] = ev->data.control.param & 0x007f;
+       bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
+       bytes[3] = ev->data.control.value & 0x007f;

        if (cmd != dev->lastcmd && !dev->nostat) {
                if (count < 9)
                        return -ENOMEM;
        if (cmd != dev->lastcmd && !dev->nostat) {
                if (count < 9)
                        return -ENOMEM;