From 7dddcd8c1610cacae33a0ee67971d597c4bdaffb Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Mon, 24 Nov 2008 09:45:57 -0200
Subject: em28xx-alsa: implement another locking schema

From: Mauro Carvalho Chehab <mchehab@redhat.com>

Instead of using a spinlock, it is better to call the proper pcm stream
locking schema.

Priority: normal

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 v4l/scripts/make_config_compat.pl | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'v4l/scripts/make_config_compat.pl')

diff --git a/v4l/scripts/make_config_compat.pl b/v4l/scripts/make_config_compat.pl
index fdbc5eaba..3aac7e3b3 100755
--- a/v4l/scripts/make_config_compat.pl
+++ b/v4l/scripts/make_config_compat.pl
@@ -159,6 +159,25 @@ sub check_proc_create()
 	close INNET;
 }
 
+sub check_pcm_lock()
+{
+	my $file = "$kdir/include/sound/pcm.h";
+	my $need_compat = 1;
+
+	open INNET, "<$file" or die "File not found: $file";
+	while (<INNET>) {
+		if (m/pcm_stream_lock/) {
+			$need_compat = 0;
+			last;
+		}
+	}
+
+	if ($need_compat) {
+		$out.= "\n#define NO_PCM_LOCK 1\n";
+	}
+	close INNET;
+}
+
 sub check_other_dependencies()
 {
 	check_spin_lock();
@@ -169,6 +188,7 @@ sub check_other_dependencies()
 	check_is_singular();
 	check_clamp();
 	check_proc_create();
+	check_pcm_lock();
 }
 
 # Do the basic rules
-- 
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