From 151edb44eea9bf25ec466133e9dbef87bd6b1372 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Fri, 13 Mar 2015 18:02:01 +0100
Subject: Add missing mutex-locking in procesc.c ; discovered design fault
 somewhere.

---
 src/kernel/core/prng.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/kernel/core/prng.c')

diff --git a/src/kernel/core/prng.c b/src/kernel/core/prng.c
index dbffba5..77dff7d 100644
--- a/src/kernel/core/prng.c
+++ b/src/kernel/core/prng.c
@@ -11,6 +11,8 @@ static const uint32_t a = 16807;
 static const uint32_t m = 0x7FFFFFFF;
 
 uint16_t prng_word() {
+	int st = enter_critical(CL_NOINT);
+
 	if (++n >= 100) {
 		n = 0;
 		if (entropy_count) {
@@ -18,7 +20,12 @@ uint16_t prng_word() {
 		}
 	}
 	x = (x * a) % m;
-	return x & 0xFFFF;
+
+	uint16_t ret = x & 0xFFFF;
+
+	exit_critical(st);
+
+	return ret;
 }
 
 void prng_bytes(uint8_t* out, size_t nbytes) {
-- 
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