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authorSteve Cornelius <steve.cornelius@freescale.com>2015-06-16 02:52:59 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2015-06-16 09:20:38 +0300
commit412c98c1bef65fe7589f1300e93735d96130307c (patch)
tree9c3fdce06977b37ace84d7f154ead430a00a43da /drivers/crypto
parent6fd4b15603124c1b56e03db29b41ec39d8a077b9 (diff)
downloadlinux-412c98c1bef65fe7589f1300e93735d96130307c.tar.xz
crypto: caam - fix RNG buffer cache alignment
The hwrng output buffers (2) are cast inside of a a struct (caam_rng_ctx) allocated in one DMA-tagged region. While the kernel's heap allocator should place the overall struct on a cacheline aligned boundary, the 2 buffers contained within may not necessarily align. Consenquently, the ends of unaligned buffers may not fully flush, and if so, stale data will be left behind, resulting in small repeating patterns. This fix aligns the buffers inside the struct. Note that not all of the data inside caam_rng_ctx necessarily needs to be DMA-tagged, only the buffers themselves require this. However, a fix would incur the expense of error-handling bloat in the case of allocation failure. Cc: stable@vger.kernel.org Signed-off-by: Steve Cornelius <steve.cornelius@freescale.com> Signed-off-by: Victoria Milhoan <vicki.milhoan@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/caam/caamrng.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index 26a544b505f1..5095337205b8 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -56,7 +56,7 @@
/* Buffer, its dma address and lock */
struct buf_data {
- u8 buf[RN_BUF_SIZE];
+ u8 buf[RN_BUF_SIZE] ____cacheline_aligned;
dma_addr_t addr;
struct completion filled;
u32 hw_desc[DESC_JOB_O_LEN];