[CRYPTO]: Simplify crypto memory allocation.

crypto/api.c

@@ -123,44 +123,26 @@ struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
 	if (alg == NULL)
 		goto out;
 	
-	tfm = kmalloc(sizeof(*tfm), GFP_KERNEL);
+	tfm = kmalloc(sizeof(*tfm) + alg->cra_ctxsize, GFP_KERNEL);
 	if (tfm == NULL)
 		goto out_put;
 
 	memset(tfm, 0, sizeof(*tfm));
 	
-	if (alg->cra_ctxsize) {
-		tfm->crt_ctx = kmalloc(alg->cra_ctxsize, GFP_KERNEL);
-		if (tfm->crt_ctx == NULL)
-			goto out_free_tfm;
-	}
+	tfm->crt_ctx = (void*) &tfm[1];
 
 	tfm->__crt_alg = alg;
 	
-	if (alg->cra_blocksize) {
-		tfm->crt_work_block = kmalloc(alg->cra_blocksize + 1,
-					      GFP_KERNEL);
-		if (tfm->crt_work_block == NULL)
-			goto out_free_ctx;
-	}
-
 	if (crypto_init_flags(tfm, flags))
-		goto out_free_work_block;
+		goto out_free_tfm;
 		
 	if (crypto_init_ops(tfm)) {
 		crypto_exit_ops(tfm);
-		goto out_free_ctx;
+		goto out_free_tfm;
 	}
 
 	goto out;
 
-out_free_work_block:
-	if (tfm->__crt_alg->cra_blocksize)
-		kfree(tfm->crt_work_block);
-
-out_free_ctx:
-	if (tfm->__crt_alg->cra_ctxsize)
-		kfree(tfm->crt_ctx);
 out_free_tfm:
 	kfree(tfm);
 	tfm = NULL;
@@ -172,12 +154,6 @@ struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
 
 void crypto_free_tfm(struct crypto_tfm *tfm)
 {
-	if (tfm->__crt_alg->cra_ctxsize)
-		kfree(tfm->crt_ctx);
-		
-	if (tfm->__crt_alg->cra_blocksize)
-		kfree(tfm->crt_work_block);
-		
 	if (crypto_tfm_alg_type(tfm) == CRYPTO_ALG_TYPE_CIPHER)
 		if (tfm->crt_cipher.cit_iv)
 			kfree(tfm->crt_cipher.cit_iv);

include/linux/crypto.h

@@ -161,7 +161,6 @@ struct compress_tfm {
 struct crypto_tfm {
 
 	void *crt_ctx;
-	void *crt_work_block;
 	u32 crt_flags;
 	
 	union {