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| author | Steffen Klassert <steffen.klassert@secunet.com> | 2010-07-07 15:30:10 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2010-07-14 20:29:28 +0800 |
| commit | 4c879170296174bde05cd1c643dac16594edee77 (patch) | |
| tree | 467afaa9ad1235caa110789621edb7726fdcb4cd | |
| parent | 7e3de7b1be6ce0643f60aed697070e2286db32cd (diff) | |
| download | lwn-4c879170296174bde05cd1c643dac16594edee77.tar.gz lwn-4c879170296174bde05cd1c643dac16594edee77.zip | |
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>
| -rw-r--r-- | crypto/pcrypt.c | 19 | ||||
| -rw-r--r-- | include/linux/padata.h | 3 | ||||
| -rw-r--r-- | kernel/padata.c | 18 |
3 files changed, 32 insertions, 8 deletions
diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c index 247178cb98ec..71ae2b2ae33b 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) diff --git a/include/linux/padata.h b/include/linux/padata.h index 8d8406246eef..e4c17f9b7c9e 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -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 diff --git a/kernel/padata.c b/kernel/padata.c index ff8de1b71e4e..e7d723a3e31d 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -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); |