1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/sbus/char/uctrl.c b/drivers/sbus/char/uctrl.c
index 5f253665a1da..079da4cb45a5 100644
--- a/drivers/sbus/char/uctrl.c
+++ b/drivers/sbus/char/uctrl.c
@@ -9,7 +9,7 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/miscdevice.h>
@@ -72,6 +72,7 @@ struct ts102_regs {
 #define UCTRL_STAT_RXNE_STA        0x04    /* receive FIFO not empty status */
 #define UCTRL_STAT_RXO_STA         0x08    /* receive FIFO overflow status */
 
+static DEFINE_MUTEX(uctrl_mutex);
 static const char *uctrl_extstatus[16] = {
         "main power available",
         "internal battery attached",
@@ -210,10 +211,10 @@ uctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 static int
 uctrl_open(struct inode *inode, struct file *file)
 {
-        lock_kernel();
+        mutex_lock(&uctrl_mutex);
         uctrl_get_event_status(global_driver);
         uctrl_get_external_status(global_driver);
-        unlock_kernel();
+        mutex_unlock(&uctrl_mutex);
         return 0;
 }