diff options
Diffstat (limited to 'drivers/char/ds1286.c')
| -rw-r--r-- | drivers/char/ds1286.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/char/ds1286.c b/drivers/char/ds1286.c index ea35ab2c9909..fb584938c9c3 100644 --- a/drivers/char/ds1286.c +++ b/drivers/char/ds1286.c @@ -27,6 +27,7 @@ * option) any later version. */ #include <linux/ds1286.h> +#include <linux/smp_lock.h> #include <linux/types.h> #include <linux/errno.h> #include <linux/miscdevice.h> @@ -252,6 +253,7 @@ static int ds1286_ioctl(struct inode *inode, struct file *file, static int ds1286_open(struct inode *inode, struct file *file) { + lock_kernel(); spin_lock_irq(&ds1286_lock); if (ds1286_status & RTC_IS_OPEN) @@ -260,10 +262,12 @@ static int ds1286_open(struct inode *inode, struct file *file) ds1286_status |= RTC_IS_OPEN; spin_unlock_irq(&ds1286_lock); + unlock_kernel(); return 0; out_busy: spin_lock_irq(&ds1286_lock); + unlock_kernel(); return -EBUSY; } |