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Commit a2985b1c authored by Gilad Ben-Yossef's avatar Gilad Ben-Yossef Committed by Jaegeuk Kim
Browse files

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: default avatarGilad Ben-Yossef <gilad@benyossef.com>
CC: Eric Biggers <ebiggers3@gmail.com>
CC: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 4bb665c7

crypto/api.c

+13 −0
Original line number Diff line number Diff line
@@ -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");

include/linux/crypto.h

+40 −0
Original line number Diff line number Diff line
@@ -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.

 */