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>
diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index 247178c..71ae2b2 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -385,6 +385,7 @@
static int __init pcrypt_init(void)
{
+ int err = -ENOMEM;
encwq = create_workqueue("pencrypt");
if (!encwq)
goto err;
@@ -400,14 +401,22 @@
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 @@
destroy_workqueue(encwq);
err:
- return -ENOMEM;
+ return err;
}
static void __exit pcrypt_exit(void)
diff --git a/include/linux/padata.h b/include/linux/padata.h
index 8d84062..e4c17f9 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -126,6 +126,7 @@
u8 flags;
#define PADATA_INIT 1
#define PADATA_RESET 2
+#define PADATA_INVALID 4
};
extern struct padata_instance *padata_alloc(const struct cpumask *cpumask,
@@ -138,6 +139,6 @@
cpumask_var_t cpumask);
extern int padata_add_cpu(struct padata_instance *pinst, int cpu);
extern int padata_remove_cpu(struct padata_instance *pinst, int cpu);
-extern void padata_start(struct padata_instance *pinst);
+extern int padata_start(struct padata_instance *pinst);
extern void padata_stop(struct padata_instance *pinst);
#endif
diff --git a/kernel/padata.c b/kernel/padata.c
index ff8de1b..e7d723a 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -485,6 +485,11 @@
BUG_ON(atomic_read(&pd->refcnt) != 0);
}
+static void __padata_start(struct padata_instance *pinst)
+{
+ pinst->flags |= PADATA_INIT;
+}
+
/* Replace the internal control stucture with a new one. */
static void padata_replace(struct padata_instance *pinst,
struct parallel_data *pd_new)
@@ -619,11 +624,20 @@
*
* @pinst: padata instance to start
*/
-void padata_start(struct padata_instance *pinst)
+int padata_start(struct padata_instance *pinst)
{
+ int err = 0;
+
mutex_lock(&pinst->lock);
- pinst->flags |= PADATA_INIT;
+
+ if (pinst->flags & PADATA_INVALID)
+ err =-EINVAL;
+
+ __padata_start(pinst);
+
mutex_unlock(&pinst->lock);
+
+ return err;
}
EXPORT_SYMBOL(padata_start);