sound/oss/dmasound: fix build when drivers are mixed =y/=m

When CONFIG_DMASOUND_ATARI=m and CONFIG_DMASOUND_Q40=y (or vice versa),
dmasound_core.o can be built without dmasound_deinit() being defined,
causing a build error:

ERROR: modpost: "dmasound_deinit" [sound/oss/dmasound/dmasound_atari.ko] undefined!

Modify dmasound_core.c and dmasound.h so that dmasound_deinit() is
always available.

The mixed modes (=y/=m) also mean that several variables and structs
have to be declared in all cases.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Link: lore.kernel.org/r/202204032138.EFT9qGEd-lkp@intel.com
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Link: https://lore.kernel.org/r/20220405234118.24830-1-rdunlap@infradead.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/oss/dmasound/dmasound.h

@@ -88,11 +88,7 @@ static inline int ioctl_return(int __user *addr, int value)
      */
 
 extern int dmasound_init(void);
-#ifdef MODULE
 extern void dmasound_deinit(void);
-#else
-#define dmasound_deinit()	do { } while (0)
-#endif
 
 /* description of the set-up applies to either hard or soft settings */
 
@@ -114,9 +110,7 @@ typedef struct {
     void *(*dma_alloc)(unsigned int, gfp_t);
     void (*dma_free)(void *, unsigned int);
     int (*irqinit)(void);
-#ifdef MODULE
     void (*irqcleanup)(void);
-#endif
     void (*init)(void);
     void (*silence)(void);
     int (*setFormat)(int);

sound/oss/dmasound/dmasound_core.c

@@ -206,12 +206,10 @@ module_param(writeBufSize, int, 0);
 
 MODULE_LICENSE("GPL");
 
-#ifdef MODULE
 static int sq_unit = -1;
 static int mixer_unit = -1;
 static int state_unit = -1;
 static int irq_installed;
-#endif /* MODULE */
 
 /* control over who can modify resources shared between play/record */
 static fmode_t shared_resource_owner;
@@ -391,9 +389,6 @@ static const struct file_operations mixer_fops =
 
 static void mixer_init(void)
 {
-#ifndef MODULE
-	int mixer_unit;
-#endif
 	mixer_unit = register_sound_mixer(&mixer_fops, -1);
 	if (mixer_unit < 0)
 		return;
@@ -1171,9 +1166,6 @@ static const struct file_operations sq_fops =
 static int sq_init(void)
 {
 	const struct file_operations *fops = &sq_fops;
-#ifndef MODULE
-	int sq_unit;
-#endif
 
 	sq_unit = register_sound_dsp(fops, -1);
 	if (sq_unit < 0) {
@@ -1366,9 +1358,6 @@ static const struct file_operations state_fops = {
 
 static int state_init(void)
 {
-#ifndef MODULE
-	int state_unit;
-#endif
 	state_unit = register_sound_special(&state_fops, SND_DEV_STATUS);
 	if (state_unit < 0)
 		return state_unit ;
@@ -1386,10 +1375,9 @@ static int state_init(void)
 int dmasound_init(void)
 {
 	int res ;
-#ifdef MODULE
+
 	if (irq_installed)
 		return -EBUSY;
-#endif
 
 	/* Set up sound queue, /dev/audio and /dev/dsp. */
 
@@ -1408,9 +1396,7 @@ int dmasound_init(void)
 		printk(KERN_ERR "DMA sound driver: Interrupt initialization failed\n");
 		return -ENODEV;
 	}
-#ifdef MODULE
 	irq_installed = 1;
-#endif
 
 	printk(KERN_INFO "%s DMA sound driver rev %03d installed\n",
 		dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) +
@@ -1424,8 +1410,6 @@ int dmasound_init(void)
 	return 0;
 }
 
-#ifdef MODULE
-
 void dmasound_deinit(void)
 {
 	if (irq_installed) {
@@ -1444,8 +1428,6 @@ void dmasound_deinit(void)
 		unregister_sound_dsp(sq_unit);
 }
 
-#else /* !MODULE */
-
 static int dmasound_setup(char *str)
 {
 	int ints[6], size;
@@ -1489,8 +1471,6 @@ static int dmasound_setup(char *str)
 
 __setup("dmasound=", dmasound_setup);
 
-#endif /* !MODULE */
-
     /*
      *  Conversion tables
      */
@@ -1577,9 +1557,7 @@ char dmasound_alaw2dma8[] = {
 
 EXPORT_SYMBOL(dmasound);
 EXPORT_SYMBOL(dmasound_init);
-#ifdef MODULE
 EXPORT_SYMBOL(dmasound_deinit);
-#endif
 EXPORT_SYMBOL(dmasound_write_sq);
 EXPORT_SYMBOL(dmasound_catchRadius);
 #ifdef HAS_8BIT_TABLES