padata: make padata_do_parallel to return zero on success

To return -EINPROGRESS on success in padata_do_parallel was
considered to be odd. This patch changes this to return zero
on success. Also the only user of padata, pcrypt is adapted to
convert a return of zero to -EINPROGRESS within the crypto layer.
This also removes the pcrypt fallback if padata_do_parallel
was called on a not running padata instance as we can't handle it
anymore. This fallback was unused, so it's save to remove it.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 11 insertions, 18 deletions

diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index 71ae2b2ae33b..6036b6de9079 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -143,10 +143,8 @@ static int pcrypt_aead_encrypt(struct aead_request *req)
         aead_request_set_assoc(creq, req->assoc, req->assoclen);
 
         err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
-        if (err)
-                return err;
-        else
-                err = crypto_aead_encrypt(creq);
+        if (!err)
+                return -EINPROGRESS;
 
         return err;
 }
@@ -187,10 +185,8 @@ static int pcrypt_aead_decrypt(struct aead_request *req)
         aead_request_set_assoc(creq, req->assoc, req->assoclen);
 
         err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_dec_padata);
-        if (err)
-                return err;
-        else
-                err = crypto_aead_decrypt(creq);
+        if (!err)
+                return -EINPROGRESS;
 
         return err;
 }
@@ -233,10 +229,8 @@ static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
         aead_givcrypt_set_giv(creq, req->giv, req->seq);
 
         err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
-        if (err)
-                return err;
-        else
-                err = crypto_aead_givencrypt(creq);
+        if (!err)
+                return -EINPROGRESS;
 
         return err;
 }
diff --git a/kernel/padata.c b/kernel/padata.c
index 57ec4eb5f2e3..ae8defcf0622 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -111,10 +111,13 @@ int padata_do_parallel(struct padata_instance *pinst,
 
         pd = rcu_dereference(pinst->pd);
 
-        err = 0;
+        err = -EINVAL;
         if (!(pinst->flags & PADATA_INIT))
                 goto out;
 
+        if (!cpumask_test_cpu(cb_cpu, pd->cpumask))
+                goto out;
+
         err =  -EBUSY;
         if ((pinst->flags & PADATA_RESET))
                 goto out;
@@ -122,11 +125,7 @@ int padata_do_parallel(struct padata_instance *pinst,
         if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM)
                 goto out;
 
-        err = -EINVAL;
-        if (!cpumask_test_cpu(cb_cpu, pd->cpumask))
-                goto out;
-
-        err = -EINPROGRESS;
+        err = 0;
         atomic_inc(&pd->refcnt);
         padata->pd = pd;
         padata->cb_cpu = cb_cpu;