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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>
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crypto/api.c
13
crypto/api.c
@ -24,6 +24,7 @@
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/completion.h>
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#include "internal.h"
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LIST_HEAD(crypto_alg_list);
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@ -595,5 +596,17 @@ int crypto_has_alg(const char *name, u32 type, u32 mask)
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}
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EXPORT_SYMBOL_GPL(crypto_has_alg);
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void crypto_req_done(struct crypto_async_request *req, int err)
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{
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struct crypto_wait *wait = req->data;
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if (err == -EINPROGRESS)
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return;
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wait->err = err;
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complete(&wait->completion);
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}
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EXPORT_SYMBOL_GPL(crypto_req_done);
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MODULE_DESCRIPTION("Cryptographic core API");
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MODULE_LICENSE("GPL");
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@ -24,6 +24,7 @@
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/completion.h>
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/*
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* Autoloaded crypto modules should only use a prefixed name to avoid allowing
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@ -467,6 +468,45 @@ struct crypto_alg {
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struct module *cra_module;
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} CRYPTO_MINALIGN_ATTR;
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/*
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* A helper struct for waiting for completion of async crypto ops
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*/
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struct crypto_wait {
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struct completion completion;
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int err;
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};
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/*
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* Macro for declaring a crypto op async wait object on stack
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*/
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#define DECLARE_CRYPTO_WAIT(_wait) \
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struct crypto_wait _wait = { \
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COMPLETION_INITIALIZER_ONSTACK((_wait).completion), 0 }
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/*
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* Async ops completion helper functioons
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*/
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void crypto_req_done(struct crypto_async_request *req, int err);
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static inline int crypto_wait_req(int err, struct crypto_wait *wait)
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{
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switch (err) {
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case -EINPROGRESS:
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case -EBUSY:
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wait_for_completion(&wait->completion);
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reinit_completion(&wait->completion);
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err = wait->err;
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break;
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};
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return err;
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}
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static inline void crypto_init_wait(struct crypto_wait *wait)
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{
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init_completion(&wait->completion);
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}
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/*
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* Algorithm registration interface.
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*/
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