1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/media/dvb/bt8xx/dst_ca.c b/drivers/media/dvb/bt8xx/dst_ca.c
index cf8705162845..48e48e8af55a 100644
--- a/drivers/media/dvb/bt8xx/dst_ca.c
+++ b/drivers/media/dvb/bt8xx/dst_ca.c
@@ -22,7 +22,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/string.h>
 #include <linux/dvb/ca.h>
 #include "dvbdev.h"
@@ -52,6 +52,7 @@
 } while(0)
 
 
+static DEFINE_MUTEX(dst_ca_mutex);
 static unsigned int verbose = 5;
 module_param(verbose, int, 0644);
 MODULE_PARM_DESC(verbose, "verbose startup messages, default is 1 (yes)");
@@ -564,7 +565,7 @@ static long dst_ca_ioctl(struct file *file, unsigned int cmd, unsigned long ioct
         void __user *arg = (void __user *)ioctl_arg;
         int result = 0;
 
-        lock_kernel();
+        mutex_lock(&dst_ca_mutex);
         dvbdev = file->private_data;
         state = (struct dst_state *)dvbdev->priv;
         p_ca_message = kmalloc(sizeof (struct ca_msg), GFP_KERNEL);
@@ -652,7 +653,7 @@ static long dst_ca_ioctl(struct file *file, unsigned int cmd, unsigned long ioct
         kfree (p_ca_slot_info);
         kfree (p_ca_caps);
 
-        unlock_kernel();
+        mutex_unlock(&dst_ca_mutex);
         return result;
 }
 
@@ -694,7 +695,8 @@ static const struct file_operations dst_ca_fops = {
         .open = dst_ca_open,
         .release = dst_ca_release,
         .read = dst_ca_read,
-        .write = dst_ca_write
+        .write = dst_ca_write,
+        .llseek = noop_llseek,
 };
 
 static struct dvb_device dvbdev_ca = {