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crypto: introduce crypto wait for async op 

Invoking a possibly async. crypto op and waiting for completion
while correctly handling backlog processing is a common task
in the crypto API implementation and outside users of it.

This patch adds a generic implementation for doing so in
preparation for using it across the board instead of hand
rolled versions.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
CC: Eric Biggers <ebiggers3@gmail.com>
CC: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gilad Ben-Yossef 2017-10-18 08:00:38 +01:00 committed by Herbert Xu
parent 3d549e325e
commit ada69a1639
2 changed files with 53 additions and 0 deletions
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13
crypto/api.c
View File

@ -24,6 +24,7 @@
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/completion.h>
#include "internal.h"
LIST_HEAD(crypto_alg_list);
@ -595,5 +596,17 @@ int crypto_has_alg(const char *name, u32 type, u32 mask)
}
EXPORT_SYMBOL_GPL(crypto_has_alg);
void crypto_req_done(struct crypto_async_request *req, int err)
{
struct crypto_wait *wait = req->data;
if (err == -EINPROGRESS)
return;
wait->err = err;
complete(&wait->completion);
}
EXPORT_SYMBOL_GPL(crypto_req_done);
MODULE_DESCRIPTION("Cryptographic core API");
MODULE_LICENSE("GPL");

40
include/linux/crypto.h
View File

@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/completion.h>
/*
* Autoloaded crypto modules should only use a prefixed name to avoid allowing
@ -467,6 +468,45 @@ struct crypto_alg {
struct module *cra_module;
} CRYPTO_MINALIGN_ATTR;
/*
* A helper struct for waiting for completion of async crypto ops
*/
struct crypto_wait {
struct completion completion;
int err;
};
/*
* Macro for declaring a crypto op async wait object on stack
*/
#define DECLARE_CRYPTO_WAIT(_wait) \
struct crypto_wait _wait = { \
COMPLETION_INITIALIZER_ONSTACK((_wait).completion), 0 }
/*
* Async ops completion helper functioons
*/
void crypto_req_done(struct crypto_async_request *req, int err);
static inline int crypto_wait_req(int err, struct crypto_wait *wait)
{
switch (err) {
case -EINPROGRESS:
case -EBUSY:
wait_for_completion(&wait->completion);
reinit_completion(&wait->completion);
err = wait->err;
break;
};
return err;
}
static inline void crypto_init_wait(struct crypto_wait *wait)
{
init_completion(&wait->completion);
}
/*
* Algorithm registration interface.
*/