File 0030-pcm-extplug-refinement-of-masks-in-extplug.patch of Package alsa.openSUSE_Leap_42.2_Update

From fbb957138135e09ed9fd0180dcad549aad815465 Mon Sep 17 00:00:00 2001
From: Awais Belal <awais_belal@mentor.com>
Date: Fri, 17 Feb 2017 12:47:49 +0530
Subject: [PATCH 30/43] pcm: extplug: refinement of masks in extplug

It should be possible to use empty mask format with extplug.
The refinement of mask via extplug is now modified,
to accept empty masks as well to work properly.

Signed-off-by: Awais Belal <awais_belal@mentor.com>
Signed-off-by: Mounesh Sutar <sutar.mounesh@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 src/pcm/pcm_extplug.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/src/pcm/pcm_extplug.c
+++ b/src/pcm/pcm_extplug.c
@@ -172,6 +172,8 @@ int snd_ext_parm_mask_refine(snd_mask_t
 	unsigned int i;
 
 	parm += type;
+	if (!parm->active)
+		return 0;
 	memset(&bits, 0, sizeof(bits));
 	for (i = 0; i < parm->num_list; i++)
 		bits.bits[parm->list[i] / 32] |= 1U << (parm->list[i] % 32);