linux-kernel - [PATCH 3.18 22/28] crypto: atmel - only treat EBUSY as transient if backlog

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Message-Id: <20170719111321.284705216@linuxfoundation.org>
Date:   Wed, 19 Jul 2017 13:15:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gilad Ben-Yossef <gilad@...yossef.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 3.18 22/28] crypto: atmel - only treat EBUSY as transient if backlog

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gilad Ben-Yossef <gilad@...yossef.com>

commit 1606043f214f912a52195293614935811a6e3e53 upstream.

The Atmel SHA driver was treating -EBUSY as indication of queueing
to backlog without checking that backlog is enabled for the request.

Fix it by checking request flags.

Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/atmel-sha.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -957,7 +957,9 @@ static int atmel_sha_finup(struct ahash_
 	ctx->flags |= SHA_FLAGS_FINUP;
 
 	err1 = atmel_sha_update(req);
-	if (err1 == -EINPROGRESS || err1 == -EBUSY)
+	if (err1 == -EINPROGRESS ||
+	    (err1 == -EBUSY && (ahash_request_flags(req) &
+				CRYPTO_TFM_REQ_MAY_BACKLOG)))
 		return err1;
 
 	/*