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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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18
kernel/padata.c
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@@ -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);