diff options
Diffstat (limited to 'drivers/s390/char/vmwatchdog.c')
| -rw-r--r-- | drivers/s390/char/vmwatchdog.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/s390/char/vmwatchdog.c b/drivers/s390/char/vmwatchdog.c index 56b3eab019c..21a2a829bf4 100644 --- a/drivers/s390/char/vmwatchdog.c +++ b/drivers/s390/char/vmwatchdog.c @@ -13,6 +13,7 @@ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/watchdog.h> +#include <linux/smp_lock.h> #include <asm/ebcdic.h> #include <asm/io.h> @@ -121,11 +122,15 @@ static int __init vmwdt_probe(void) static int vmwdt_open(struct inode *i, struct file *f) { int ret; - if (test_and_set_bit(0, &vmwdt_is_open)) + lock_kernel(); + if (test_and_set_bit(0, &vmwdt_is_open)) { + unlock_kernel(); return -EBUSY; + } ret = vmwdt_keepalive(); if (ret) clear_bit(0, &vmwdt_is_open); + unlock_kernel(); return ret ? ret : nonseekable_open(i, f); } |