ALSA: rawmidi: Skip UMP devices at SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE

Applications may look for rawmidi devices with the ioctl
SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE.  Returning a UMP device from this
ioctl may confuse the existing applications that support only the
legacy rawmidi.

This patch changes the code to skip the UMP devices from the lookup
for avoiding the confusion, and introduces a new ioctl to look for the
UMP devices instead.

Along with this change, bump the CTL protocol version to 2.0.9.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 36 insertions, 21 deletions

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 6360e2239a63..9936ed282b85 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -1012,6 +1012,37 @@ static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long
 	return -ENOTTY;
 }
 
+/* ioctl to find the next device; either legacy or UMP depending on @find_ump */
+static int snd_rawmidi_next_device(struct snd_card *card, int __user *argp,
+				   bool find_ump)
+
+{
+	struct snd_rawmidi *rmidi;
+	int device;
+	bool is_ump;
+
+	if (get_user(device, argp))
+		return -EFAULT;
+	if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
+		device = SNDRV_RAWMIDI_DEVICES - 1;
+	mutex_lock(&register_mutex);
+	device = device < 0 ? 0 : device + 1;
+	for (; device < SNDRV_RAWMIDI_DEVICES; device++) {
+		rmidi = snd_rawmidi_search(card, device);
+		if (!rmidi)
+			continue;
+		is_ump = rawmidi_is_ump(rmidi);
+		if (find_ump == is_ump)
+			break;
+	}
+	if (device == SNDRV_RAWMIDI_DEVICES)
+		device = -1;
+	mutex_unlock(&register_mutex);
+	if (put_user(device, argp))
+		return -EFAULT;
+	return 0;
+}
+
 static int snd_rawmidi_control_ioctl(struct snd_card *card,
 				     struct snd_ctl_file *control,
 				     unsigned int cmd,
@@ -1021,27 +1052,11 @@ static int snd_rawmidi_control_ioctl(struct snd_card *card,
 
 	switch (cmd) {
 	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
-	{
-		int device;
-
-		if (get_user(device, (int __user *)argp))
-			return -EFAULT;
-		if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
-			device = SNDRV_RAWMIDI_DEVICES - 1;
-		mutex_lock(&register_mutex);
-		device = device < 0 ? 0 : device + 1;
-		while (device < SNDRV_RAWMIDI_DEVICES) {
-			if (snd_rawmidi_search(card, device))
-				break;
-			device++;
-		}
-		if (device == SNDRV_RAWMIDI_DEVICES)
-			device = -1;
-		mutex_unlock(&register_mutex);
-		if (put_user(device, (int __user *)argp))
-			return -EFAULT;
-		return 0;
-	}
+		return snd_rawmidi_next_device(card, argp, false);
+#if IS_ENABLED(CONFIG_SND_UMP)
+	case SNDRV_CTL_IOCTL_UMP_NEXT_DEVICE:
+		return snd_rawmidi_next_device(card, argp, true);
+#endif
 	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 	{
 		int val;