From ada69a1639eca54ff74d839a6513c43db8d57d70 Mon Sep 17 00:00:00 2001 From: Gilad Ben-Yossef Date: Wed, 18 Oct 2017 08:00:38 +0100 Subject: 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 CC: Eric Biggers CC: Jonathan Cameron Signed-off-by: Herbert Xu --- include/linux/crypto.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) (limited to 'include/linux/crypto.h') diff --git a/include/linux/crypto.h b/include/linux/crypto.h index 84da9978e951..78508ca4b108 100644 --- a/include/linux/crypto.h +++ b/include/linux/crypto.h @@ -24,6 +24,7 @@ #include #include #include +#include /* * 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. */ -- cgit v1.2.3-59-g8ed1b