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Diffstat (limited to 'sound/oss/sh_dac_audio.c')
-rw-r--r--sound/oss/sh_dac_audio.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/sound/oss/sh_dac_audio.c b/sound/oss/sh_dac_audio.c
index 4153752507e3..8f0be4053a5a 100644
--- a/sound/oss/sh_dac_audio.c
+++ b/sound/oss/sh_dac_audio.c
@@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/sound.h>
+#include <linux/smp_lock.h>
#include <linux/soundcard.h>
#include <linux/interrupt.h>
#include <linux/hrtimer.h>
@@ -216,13 +217,17 @@ static int dac_audio_open(struct inode *inode, struct file *file)
{
if (file->f_mode & FMODE_READ)
return -ENODEV;
- if (in_use)
+
+ lock_kernel();
+ if (in_use) {
+ unlock_kernel();
return -EBUSY;
+ }
in_use = 1;
dac_audio_start();
-
+ unlock_kernel();
return 0;
}