ALSA: emu10k1: make snd_emu10k1_voice_alloc() assign voices' epcm

The voice allocator clearly knows about the field (it resets it), so
it's more consistent (and leads to less duplicated code) to have the
constructor take it as a parameter.
Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230518140947.3725394-7-oswald.buddenhagen@gmx.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/emu10k1.h

@@ -1850,7 +1850,8 @@ int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_me
 int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk);
 
 /* voice allocation */
-int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int pair, struct snd_emu10k1_voice **rvoice);
+int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int pair,
+			    struct snd_emu10k1_pcm *epcm, struct snd_emu10k1_voice **rvoice);
 int snd_emu10k1_voice_free(struct snd_emu10k1 *emu, struct snd_emu10k1_voice *pvoice);
 
 /* MIDI uart */

sound/pci/emu10k1/emu10k1_callback.c

@@ -287,7 +287,7 @@ get_voice(struct snd_emux *emu, struct snd_emux_port *port)
 			if (vp->ch < 0) {
 				/* allocate a voice */
 				struct snd_emu10k1_voice *hwvoice;
-				if (snd_emu10k1_voice_alloc(hw, EMU10K1_SYNTH, 1, &hwvoice) < 0 || hwvoice == NULL)
+				if (snd_emu10k1_voice_alloc(hw, EMU10K1_SYNTH, 1, NULL, &hwvoice) < 0 || hwvoice == NULL)
 					continue;
 				vp->ch = hwvoice->number;
 				emu->num_voices++;

sound/pci/emu10k1/emupcm.c

@@ -95,15 +95,13 @@ static int snd_emu10k1_pcm_channel_alloc(struct snd_emu10k1_pcm * epcm, int voic
 	err = snd_emu10k1_voice_alloc(epcm->emu,
 				      epcm->type == PLAYBACK_EMUVOICE ? EMU10K1_PCM : EMU10K1_EFX,
 				      voices,
-				      &epcm->voices[0]);
+				      epcm, &epcm->voices[0]);
 	
 	if (err < 0)
 		return err;
-	epcm->voices[0]->epcm = epcm;
 	if (voices > 1) {
 		for (i = 1; i < voices; i++) {
 			epcm->voices[i] = &epcm->emu->voices[(epcm->voices[0]->number + i) % NUM_G];
-			epcm->voices[i]->epcm = epcm;
 		}
 	}
 	if (epcm->extra == NULL) {
@@ -114,7 +112,7 @@ static int snd_emu10k1_pcm_channel_alloc(struct snd_emu10k1_pcm * epcm, int voic
 		err = snd_emu10k1_voice_alloc(epcm->emu,
 					      epcm->type == PLAYBACK_EMUVOICE ? EMU10K1_PCM_IRQ : EMU10K1_EFX_IRQ,
 					      1,
-					      &epcm->extra);
+					      epcm, &epcm->extra);
 		if (err < 0) {
 			/*
 			dev_dbg(emu->card->dev, "pcm_channel_alloc: "
@@ -124,7 +122,6 @@ static int snd_emu10k1_pcm_channel_alloc(struct snd_emu10k1_pcm * epcm, int voic
 			snd_emu10k1_pcm_free_voices(epcm);
 			return err;
 		}
-		epcm->extra->epcm = epcm;
 		epcm->extra->interrupt = snd_emu10k1_pcm_interrupt;
 	}
 

sound/pci/emu10k1/voice.c

@@ -32,7 +32,7 @@
  */
 
 static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
-		       struct snd_emu10k1_voice **rvoice)
+		       struct snd_emu10k1_pcm *epcm, struct snd_emu10k1_voice **rvoice)
 {
 	struct snd_emu10k1_voice *voice;
 	int i, j, k, first_voice, last_voice, skip;
@@ -79,6 +79,7 @@ static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
 		       voice->number, idx-first_voice+1, number);
 		*/
 		voice->use = type;
+		voice->epcm = epcm;
 	}
 	*rvoice = &emu->voices[first_voice];
 	return 0;
@@ -95,7 +96,7 @@ static void voice_free(struct snd_emu10k1 *emu,
 }
 
 int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
-			    struct snd_emu10k1_voice **rvoice)
+			    struct snd_emu10k1_pcm *epcm, struct snd_emu10k1_voice **rvoice)
 {
 	unsigned long flags;
 	int result;
@@ -107,7 +108,7 @@ int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
 
 	spin_lock_irqsave(&emu->voice_lock, flags);
 	for (;;) {
-		result = voice_alloc(emu, type, number, rvoice);
+		result = voice_alloc(emu, type, number, epcm, rvoice);
 		if (result == 0 || type == EMU10K1_SYNTH)
 			break;