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-rw-r--r--drivers/char/hw_random/core.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 662d60e44e9a..e5d583c84e4f 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -37,6 +37,7 @@
37#include <linux/kernel.h> 37#include <linux/kernel.h>
38#include <linux/fs.h> 38#include <linux/fs.h>
39#include <linux/sched.h> 39#include <linux/sched.h>
40#include <linux/smp_lock.h>
40#include <linux/init.h> 41#include <linux/init.h>
41#include <linux/miscdevice.h> 42#include <linux/miscdevice.h>
42#include <linux/delay.h> 43#include <linux/delay.h>
@@ -86,6 +87,7 @@ static int rng_dev_open(struct inode *inode, struct file *filp)
86 return -EINVAL; 87 return -EINVAL;
87 if (filp->f_mode & FMODE_WRITE) 88 if (filp->f_mode & FMODE_WRITE)
88 return -EINVAL; 89 return -EINVAL;
90 cycle_kernel_lock();
89 return 0; 91 return 0;
90} 92}
91 93