crypto: mv_cesa - fix hashing of chunks > 1920 bytes

This was broken by commit 7759995c75ae0cbd4c861582908449f6b6208e7a (yes,
myself). The basic problem here is since the digest state is only saved
after the last chunk, the state array is only valid when handling the
first chunk of the next buffer. Broken since linux-3.0.

Signed-off-by: Phil Sutter <phil.sutter@viprinet.com>
Cc: <stable@kernel.org> # 3.1.x
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/crypto/mv_cesa.c b/drivers/crypto/mv_cesa.c
index 3cf303ee3fe3..38a3297ae2be 100644
--- a/drivers/crypto/mv_cesa.c
+++ b/drivers/crypto/mv_cesa.c
@@ -342,11 +342,13 @@ static void mv_process_hash_current(int first_block)
                 else
                         op.config |= CFG_MID_FRAG;
 
-                writel(req_ctx->state[0], cpg->reg + DIGEST_INITIAL_VAL_A);
-                writel(req_ctx->state[1], cpg->reg + DIGEST_INITIAL_VAL_B);
-                writel(req_ctx->state[2], cpg->reg + DIGEST_INITIAL_VAL_C);
-                writel(req_ctx->state[3], cpg->reg + DIGEST_INITIAL_VAL_D);
-                writel(req_ctx->state[4], cpg->reg + DIGEST_INITIAL_VAL_E);
+                if (first_block) {
+                        writel(req_ctx->state[0], cpg->reg + DIGEST_INITIAL_VAL_A);
+                        writel(req_ctx->state[1], cpg->reg + DIGEST_INITIAL_VAL_B);
+                        writel(req_ctx->state[2], cpg->reg + DIGEST_INITIAL_VAL_C);
+                        writel(req_ctx->state[3], cpg->reg + DIGEST_INITIAL_VAL_D);
+                        writel(req_ctx->state[4], cpg->reg + DIGEST_INITIAL_VAL_E);
+                }
         }
 
         memcpy(cpg->sram + SRAM_CONFIG, &op, sizeof(struct sec_accel_config));