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From:   Eric Biggers <ebiggers@kernel.org>
To:     linux-crypto@vger.kernel.org
Cc:     stable@vger.kernel.org,
        "Martin K . Petersen" <martin.petersen@oracle.com>
Subject: [PATCH v2] crypto: algapi - Avoid spurious modprobe on LOADED
Date:   Mon,  6 Apr 2020 23:02:40 -0700
Message-Id: <20200407060240.175837-1-ebiggers@kernel.org>
In-Reply-To: <20200407051744.GA13037@gondor.apana.org.au>
References: <20200407051744.GA13037@gondor.apana.org.au>
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From: Eric Biggers <ebiggers@google.com>

Currently after any algorithm is registered and tested, there's an
unnecessary request_module("cryptomgr") even if it's already loaded.
Also, CRYPTO_MSG_ALG_LOADED is sent twice, and thus if the algorithm is
"crct10dif", lib/crc-t10dif.c replaces the tfm twice rather than once.

This occurs because CRYPTO_MSG_ALG_LOADED is sent using
crypto_probing_notify(), which tries to load "cryptomgr" if the
notification is not handled (NOTIFY_DONE).  This doesn't make sense
because "cryptomgr" doesn't handle this notification.

Fix this by using crypto_notify() instead of crypto_probing_notify().

Fixes: dd8b083f9a5e ("crypto: api - Introduce notifier for new crypto algorithms")
Cc: <stable@vger.kernel.org> # v4.20+
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 crypto/algapi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 69605e21af92..849254d7e627 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -403,7 +403,7 @@ static void crypto_wait_for_test(struct crypto_larval *larval)
 	err = wait_for_completion_killable(&larval->completion);
 	WARN_ON(err);
 	if (!err)
-		crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
+		crypto_notify(CRYPTO_MSG_ALG_LOADED, larval);
 
 out:
 	crypto_larval_kill(&larval->alg);
-- 
2.26.0