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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 4949044773b..6eabb7022a2 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -7,6 +7,7 @@
* of the GNU General Public License, incorporated herein by reference.
*/
#include <linux/sched.h>
+#include <linux/smp_lock.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
@@ -33,6 +34,8 @@ static DECLARE_WAIT_QUEUE_HEAD(host_read_wait);
static int rng_dev_open (struct inode *inode, struct file *filp)
{
+ cycle_kernel_lock();
+
/* enforce read-only access to this chrdev */
if ((filp->f_mode & FMODE_READ) == 0)
return -EINVAL;