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-rw-r--r--arch/um/drivers/random.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index 4949044773ba..6eabb7022a2d 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -7,6 +7,7 @@
7 * of the GNU General Public License, incorporated herein by reference. 7 * of the GNU General Public License, incorporated herein by reference.
8 */ 8 */
9#include <linux/sched.h> 9#include <linux/sched.h>
10#include <linux/smp_lock.h>
10#include <linux/module.h> 11#include <linux/module.h>
11#include <linux/fs.h> 12#include <linux/fs.h>
12#include <linux/interrupt.h> 13#include <linux/interrupt.h>
@@ -33,6 +34,8 @@ static DECLARE_WAIT_QUEUE_HEAD(host_read_wait);
33 34
34static int rng_dev_open (struct inode *inode, struct file *filp) 35static int rng_dev_open (struct inode *inode, struct file *filp)
35{ 36{
37 cycle_kernel_lock();
38
36 /* enforce read-only access to this chrdev */ 39 /* enforce read-only access to this chrdev */
37 if ((filp->f_mode & FMODE_READ) == 0) 40 if ((filp->f_mode & FMODE_READ) == 0)
38 return -EINVAL; 41 return -EINVAL;