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-rw-r--r--drivers/sbus/char/rtc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/sbus/char/rtc.c b/drivers/sbus/char/rtc.c
index 18d18f1a114e..b0429917154d 100644
--- a/drivers/sbus/char/rtc.c
+++ b/drivers/sbus/char/rtc.c
@@ -12,6 +12,7 @@
12 */ 12 */
13 13
14#include <linux/module.h> 14#include <linux/module.h>
15#include <linux/smp_lock.h>
15#include <linux/types.h> 16#include <linux/types.h>
16#include <linux/errno.h> 17#include <linux/errno.h>
17#include <linux/miscdevice.h> 18#include <linux/miscdevice.h>
@@ -213,6 +214,7 @@ static int rtc_open(struct inode *inode, struct file *file)
213{ 214{
214 int ret; 215 int ret;
215 216
217 lock_kernel();
216 spin_lock_irq(&mostek_lock); 218 spin_lock_irq(&mostek_lock);
217 if (rtc_busy) { 219 if (rtc_busy) {
218 ret = -EBUSY; 220 ret = -EBUSY;
@@ -221,6 +223,7 @@ static int rtc_open(struct inode *inode, struct file *file)
221 ret = 0; 223 ret = 0;
222 } 224 }
223 spin_unlock_irq(&mostek_lock); 225 spin_unlock_irq(&mostek_lock);
226 unlock_kernel();
224 227
225 return ret; 228 return ret;
226} 229}