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padata: Check for valid padata instance on start

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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>
This commit is contained in:
Steffen Klassert 2010-07-07 15:30:10 +02:00 committed by Herbert Xu
parent 7e3de7b1be
commit 4c87917029
3 changed files with 32 additions and 8 deletions
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19
crypto/pcrypt.c
View File

@ -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 @@ static int __init pcrypt_init(void)
destroy_workqueue(encwq);
err:
return -ENOMEM;
return err;
}
static void __exit pcrypt_exit(void)

3
include/linux/padata.h
View File

@ -126,6 +126,7 @@ struct padata_instance {
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 @@ extern int padata_set_cpumask(struct padata_instance *pinst,
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

18
kernel/padata.c
View File

@ -485,6 +485,11 @@ static void padata_flush_queues(struct parallel_data *pd)
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 @@ EXPORT_SYMBOL(padata_remove_cpu);
*
* @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);