diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 6f497aa1b276..9203f2d130c0 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -238,7 +238,10 @@ static ssize_t rng_dev_read(struct file *filp, char __user *buf,
 			goto out;
 		}
 
-		mutex_lock(&reading_mutex);
+		if (mutex_lock_interruptible(&reading_mutex)) {
+			err = -ERESTARTSYS;
+			goto out_put;
+		}
 		if (!data_avail) {
 			bytes_read = rng_get_data(rng, rng_buffer,
 				rng_buffer_size(),
@@ -288,6 +291,7 @@ static ssize_t rng_dev_read(struct file *filp, char __user *buf,
 
 out_unlock_reading:
 	mutex_unlock(&reading_mutex);
+out_put:
 	put_rng(rng);
 	goto out;
 }