From eed89d0f9d3383851cec634565a6414fae70fe91 Mon Sep 17 00:00:00 2001
From: Ian Molton <ian.molton@collabora.co.uk>
Date: Thu, 3 Dec 2009 13:50:42 +0800
Subject: hwrng: core - Prevent too-small buffer sizes
This patch prevents the hw_random core using too small of a buffer
on machines with small cacheline sizes.
Signed-off-by: Ian Molton <ian.molton@collabora.co.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
drivers/char/hw_random/core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
(limited to 'drivers/char')
diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c
index 5c2d13c6e189..8b7d56a0fe3a 100644
--- a/drivers/char/hw_random/core.c
+++ b/drivers/char/hw_random/core.c
@@ -53,7 +53,8 @@ static struct hwrng *current_rng;
static LIST_HEAD(rng_list);
static DEFINE_MUTEX(rng_mutex);
static int data_avail;
-static u8 rng_buffer[SMP_CACHE_BYTES] __cacheline_aligned;
+static u8 rng_buffer[SMP_CACHE_BYTES < 32 ? 32 : SMP_CACHE_BYTES]
+ __cacheline_aligned;
static inline int hwrng_init(struct hwrng *rng)
{
--
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