Fix a build of soc-pcm.c with older kernels without mutex_lock_nested()

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/soc/soc-pcm.c b/soc/soc-pcm.c
index fa69edd30..ae7c63296 100644
--- a/soc/soc-pcm.c
+++ b/soc/soc-pcm.c
@@ -1,2 +1,8 @@
 #include "adriver.h"
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18)
+#include <linux/mutex.h>
+#ifndef mutex_lock_nested
+#define mutex_lock_nested(a, b) mutex_lock(a)
+#endif
+#endif
 #include "../alsa-kernel/soc/soc-pcm.c"