diff options
Diffstat (limited to 'drivers/char/rtc.c')
| -rw-r--r-- | drivers/char/rtc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c index 909cac93fa2..fa92a8af5a5 100644 --- a/drivers/char/rtc.c +++ b/drivers/char/rtc.c @@ -73,6 +73,7 @@ #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/spinlock.h> +#include <linux/smp_lock.h> #include <linux/sysctl.h> #include <linux/wait.h> #include <linux/bcd.h> @@ -734,6 +735,7 @@ static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, * needed here. Or anywhere else in this driver. */ static int rtc_open(struct inode *inode, struct file *file) { + lock_kernel(); spin_lock_irq(&rtc_lock); if (rtc_status & RTC_IS_OPEN) @@ -743,10 +745,12 @@ static int rtc_open(struct inode *inode, struct file *file) rtc_irq_data = 0; spin_unlock_irq(&rtc_lock); + unlock_kernel(); return 0; out_busy: spin_unlock_irq(&rtc_lock); + unlock_kernel(); return -EBUSY; } |