crypto: omap - Avoid redundant copy when using truncated sg list

omap_crypto_cleanup() currently copies data from sg to orig if either
copy flag is set.  However OMAP_CRYPTO_SG_COPIED means that sg refers
to the same pages as orig, truncated to len bytes.  There is no need
to copy in this case.

Only copy data if the OMAP_CRYPTO_DATA_COPIED flag is set.

Fixes: 74ed87e7e7f7 ("crypto: omap - add base support library for common ...")
Signed-off-by: Ben Hutchings <ben.hutchings@mind.be>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/omap-crypto.c b/drivers/crypto/omap-crypto.c
index 31bdb1d..a4cc6bf 100644 (file)
--- a/drivers/crypto/omap-crypto.c
+++ b/drivers/crypto/omap-crypto.c
@@ -210,7 +210,7 @@ void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig,
        buf = sg_virt(sg);
        pages = get_order(len);
 
-       if (orig && (flags & OMAP_CRYPTO_COPY_MASK))
+       if (orig && (flags & OMAP_CRYPTO_DATA_COPIED))
                omap_crypto_copy_data(sg, orig, offset, len);
 
        if (flags & OMAP_CRYPTO_DATA_COPIED)