[PATCH v2] sound/oss/dmasound: fix build when drivers are mixed =y/=m

[Randy Dunlap]

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 so that dmasound_deinit() is always available.

Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: lore.kernel.org/r/202204032138.EFT9qGEd-lkp@xxxxxxxxx
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Jaroslav Kysela <perex@xxxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxxx>
Cc: alsa-devel@xxxxxxxxxxxxxxxx
---
#Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") # "forever, but backport not important"

 sound/oss/dmasound/dmasound.h      |    4 ----
 sound/oss/dmasound/dmasound_core.c |   10 +++++-----
 2 files changed, 5 insertions(+), 9 deletions(-)

--- linux-next-20220401.orig/sound/oss/dmasound/dmasound_core.c
+++ linux-next-20220401/sound/oss/dmasound/dmasound_core.c
@@ -1424,27 +1424,29 @@ int dmasound_init(void)
 	return 0;
 }
 
-#ifdef MODULE
-
 void dmasound_deinit(void)
 {
+#ifdef MODULE
 	if (irq_installed) {
 		sound_silence();
 		dmasound.mach.irqcleanup();
 		irq_installed = 0;
 	}
+#endif
 
 	write_sq_release_buffers();
 
+#ifdef MODULE
 	if (mixer_unit >= 0)
 		unregister_sound_mixer(mixer_unit);
 	if (state_unit >= 0)
 		unregister_sound_special(state_unit);
 	if (sq_unit >= 0)
 		unregister_sound_dsp(sq_unit);
+#endif
 }
 
-#else /* !MODULE */
+#ifndef MODULE
 
 static int dmasound_setup(char *str)
 {
@@ -1577,9 +1579,7 @@ 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
--- linux-next-20220401.orig/sound/oss/dmasound/dmasound.h
+++ linux-next-20220401/sound/oss/dmasound/dmasound.h
@@ -88,11 +88,7 @@ static inline int ioctl_return(int __use
      */
 
 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 */