From 15de74750099f64d786f4b9a2dcce0f0a5d7fef1 Mon Sep 17 00:00:00 2001
From: Alexandre Ratchov <ratchov@cvs.openbsd.org>
Date: Thu, 8 Dec 2016 17:23:34 +0000
Subject: Return ENODEV if playback is requested on devices with no DACs or
 recording is requested on devices with no ADCs. Many thanks to Bryan
 Vyhmeister <bryan at bsdjournal.net> for testing & debugging this.

---
 sys/dev/pci/azalia.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'sys/dev/pci')

diff --git a/sys/dev/pci/azalia.c b/sys/dev/pci/azalia.c
index 57ee558e308..50697901e2d 100644
--- a/sys/dev/pci/azalia.c
+++ b/sys/dev/pci/azalia.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: azalia.c,v 1.229 2016/09/19 06:46:44 ratchov Exp $	*/
+/*	$OpenBSD: azalia.c,v 1.230 2016/12/08 17:23:33 ratchov Exp $	*/
 /*	$NetBSD: azalia.c,v 1.20 2006/05/07 08:31:44 kent Exp $	*/
 
 /*-
@@ -41,6 +41,7 @@
  */
 
 #include <sys/param.h>
+#include <sys/fcntl.h>
 #include <sys/device.h>
 #include <sys/malloc.h>
 #include <sys/systm.h>
@@ -3842,6 +3843,10 @@ azalia_open(void *v, int flags)
 	DPRINTFN(1, ("%s: flags=0x%x\n", __func__, flags));
 	az = v;
 	codec = &az->codecs[az->codecno];
+	if ((flags & FWRITE) && codec->dacs.ngroups == 0)
+		return ENODEV;
+	if ((flags & FREAD) && codec->adcs.ngroups == 0)
+		return ENODEV;
 	codec->running++;
 	return 0;
 }
-- 
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