diff options
Diffstat (limited to 'drivers/s390/char/vmcp.c')
| -rw-r--r-- | drivers/s390/char/vmcp.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c index 2f419b0ea62..bf3dc6e0e33 100644 --- a/drivers/s390/char/vmcp.c +++ b/drivers/s390/char/vmcp.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> #include <linux/miscdevice.h> #include <linux/module.h> +#include <linux/smp_lock.h> #include <asm/cpcmd.h> #include <asm/debug.h> #include <asm/uaccess.h> @@ -39,11 +40,14 @@ static int vmcp_open(struct inode *inode, struct file *file) session = kmalloc(sizeof(*session), GFP_KERNEL); if (!session) return -ENOMEM; + + lock_kernel(); session->bufsize = PAGE_SIZE; session->response = NULL; session->resp_size = 0; mutex_init(&session->mutex); file->private_data = session; + unlock_kernel(); return nonseekable_open(inode, file); } |