fs: ecryptfs: Use crypto_wait_req

This patch replaces the custom crypto completion function with
crypto_req_done.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

fs/ecryptfs/crypto.c

@@ -260,22 +260,6 @@ int virt_to_scatterlist(const void *addr, int size, struct scatterlist *sg,
 	return i;
 }
 
-struct extent_crypt_result {
-	struct completion completion;
-	int rc;
-};
-
-static void extent_crypt_complete(struct crypto_async_request *req, int rc)
-{
-	struct extent_crypt_result *ecr = req->data;
-
-	if (rc == -EINPROGRESS)
-		return;
-
-	ecr->rc = rc;
-	complete(&ecr->completion);
-}
-
 /**
  * crypt_scatterlist
  * @crypt_stat: Pointer to the crypt_stat struct to initialize.
@@ -293,7 +277,7 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
 			     unsigned char *iv, int op)
 {
 	struct skcipher_request *req = NULL;
-	struct extent_crypt_result ecr;
+	DECLARE_CRYPTO_WAIT(ecr);
 	int rc = 0;
 
 	if (unlikely(ecryptfs_verbosity > 0)) {
@@ -303,8 +287,6 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
 				  crypt_stat->key_size);
 	}
 
-	init_completion(&ecr.completion);
-
 	mutex_lock(&crypt_stat->cs_tfm_mutex);
 	req = skcipher_request_alloc(crypt_stat->tfm, GFP_NOFS);
 	if (!req) {
@@ -315,7 +297,7 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
 
 	skcipher_request_set_callback(req,
 			CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
-			extent_crypt_complete, &ecr);
+			crypto_req_done, &ecr);
 	/* Consider doing this once, when the file is opened */
 	if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
 		rc = crypto_skcipher_setkey(crypt_stat->tfm, crypt_stat->key,
@@ -334,13 +316,7 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
 	skcipher_request_set_crypt(req, src_sg, dst_sg, size, iv);
 	rc = op == ENCRYPT ? crypto_skcipher_encrypt(req) :
 			     crypto_skcipher_decrypt(req);
-	if (rc == -EINPROGRESS || rc == -EBUSY) {
+	rc = crypto_wait_req(rc, &ecr);
-		struct extent_crypt_result *ecr = req->base.data;
-
-		wait_for_completion(&ecr->completion);
-		rc = ecr->rc;
-		reinit_completion(&ecr->completion);
-	}
 out:
 	skcipher_request_free(req);
 	return rc;