crypto: skcipher - add the ability to abort a skcipher walk

After starting a skcipher walk, the only way to ensure that all
resources it has tied up are released is to complete it. In some
cases, it will be useful to be able to abort a walk cleanly after
it has started, so add this ability to the skcipher walk API.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index d68faa5759ad29a68944e571ff2b065c2586717b..734b6f7081b8a72954f450562afa64a968b75beb 100644 (file)
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -148,6 +148,11 @@ int skcipher_walk_aead_decrypt(struct skcipher_walk *walk,
                               struct aead_request *req, bool atomic);
 void skcipher_walk_complete(struct skcipher_walk *walk, int err);
 
+static inline void skcipher_walk_abort(struct skcipher_walk *walk)
+{
+       skcipher_walk_done(walk, -ECANCELED);
+}
+
 static inline void ablkcipher_request_complete(struct ablkcipher_request *req,
                                               int err)
 {