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ALSA: usb-audio: Declare the common variable in header file 

Declare snd_usb_feature_unit_ctl properly in mixer.h.  Otherwise it's
error-prone.

This fixes the sparse warning:
  sound/usb/mixer.c:1464:25: warning: symbol 'snd_usb_feature_unit_ctl' was not declared. Should it be static?

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2018-07-25 23:00:53 +02:00
parent 7e9c20f403
commit 00966dcdf0
2 changed files with 2 additions and 2 deletions
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2
sound/usb/mixer.h
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@ -109,4 +109,6 @@ int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
extern void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl);
extern struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
#endif /* __USBMIXER_H */

2
sound/usb/mixer_quirks.c
View File

@ -47,8 +47,6 @@
#include "mixer_us16x08.h"
#include "helper.h"
extern struct snd_kcontrol_new *snd_usb_feature_unit_ctl;
struct std_mono_table {
unsigned int unitid, control, cmask;
int val_type;