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hwrng: core - Prevent too-small buffer sizes

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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>
This commit is contained in:
Ian Molton
2009-12-03 13:50:42 +08:00
committed by Herbert Xu
parent bb347d9807
commit eed89d0f9d
1 changed files with 2 additions and 1 deletions
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drivers/char/hw_random/core.c
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@ -53,7 +53,8 @@ static struct hwrng *current_rng;
static LIST_HEAD(rng_list); static LIST_HEAD(rng_list);
static DEFINE_MUTEX(rng_mutex); static DEFINE_MUTEX(rng_mutex);
static int data_avail; 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) static inline int hwrng_init(struct hwrng *rng)
{ {