padata: Check for valid padata instance on start

This patch introduces the PADATA_INVALID flag which is
checked on padata start. This will be used to mark a padata
instance as invalid, if the padata cpumask does not intersect
with the active cpumask. we change padata_start to return an
error if the PADATA_INVALID is set. Also we adapt the only
padata user, pcrypt to this change.

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

1 files changed, 14 insertions, 5 deletions

diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index 247178cb98e..71ae2b2ae33 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -385,6 +385,7 @@ static struct crypto_template pcrypt_tmpl = {
 
 static int __init pcrypt_init(void)
 {
+        int err = -ENOMEM;
         encwq = create_workqueue("pencrypt");
         if (!encwq)
                 goto err;
@@ -400,14 +401,22 @@ static int __init pcrypt_init(void)
 
         pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);
         if (!pcrypt_dec_padata)
-                goto err_free_padata;
+                goto err_free_enc_padata;
 
-        padata_start(pcrypt_enc_padata);
-        padata_start(pcrypt_dec_padata);
+        err = padata_start(pcrypt_enc_padata);
+        if (err)
+                goto err_free_dec_padata;
+
+        err = padata_start(pcrypt_dec_padata);
+        if (err)
+                goto err_free_dec_padata;
 
         return crypto_register_template(&pcrypt_tmpl);
 
-err_free_padata:
+err_free_dec_padata:
+        padata_free(pcrypt_dec_padata);
+
+err_free_enc_padata:
         padata_free(pcrypt_enc_padata);
 
 err_destroy_decwq:
@@ -417,7 +426,7 @@ err_destroy_encwq:
         destroy_workqueue(encwq);
 
 err:
-        return -ENOMEM;
+        return err;
 }
 
 static void __exit pcrypt_exit(void)