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>
git-mirror · Dec 3, 2009 · eed89d0 · eed89d0
1 parent bb347d9
commit eed89d0
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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)
 {