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path: root/drivers/char/genrtc.c
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Diffstat (limited to 'drivers/char/genrtc.c')
-rw-r--r--drivers/char/genrtc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index 69f0a29..aac0985 100644
--- a/drivers/char/genrtc.c
+++ b/drivers/char/genrtc.c
@@ -51,6 +51,7 @@
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
#include <linux/workqueue.h>
#include <asm/uaccess.h>
@@ -338,12 +339,16 @@ static int gen_rtc_ioctl(struct inode *inode, struct file *file,
static int gen_rtc_open(struct inode *inode, struct file *file)
{
- if (gen_rtc_status & RTC_IS_OPEN)
+ lock_kernel();
+ if (gen_rtc_status & RTC_IS_OPEN) {
+ unlock_kernel();
return -EBUSY;
+ }
gen_rtc_status |= RTC_IS_OPEN;
gen_rtc_irq_data = 0;
irq_active = 0;
+ unlock_kernel();
return 0;
}
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