linux-kernel - [PATCH v3 10/12] crypto: atmel-aes: fix atmel_aes_handle

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Date:   Thu, 26 Jan 2017 17:07:55 +0100
From:   Cyrille Pitchen <cyrille.pitchen@...el.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <nicolas.ferre@...el.com>
CC:     <smueller@...onox.de>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: [PATCH v3 10/12] crypto: atmel-aes: fix atmel_aes_handle_queue()

This patch fixes the value returned by atmel_aes_handle_queue(), which
could have been wrong previously when the crypto request was started
synchronously but became asynchronous during the ctx->start() call.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
---
 drivers/crypto/atmel-aes.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
index 0e3d0d655b96..9fd2f63b8bc0 100644
--- a/drivers/crypto/atmel-aes.c
+++ b/drivers/crypto/atmel-aes.c
@@ -879,6 +879,7 @@ static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
 	struct crypto_async_request *areq, *backlog;
 	struct atmel_aes_base_ctx *ctx;
 	unsigned long flags;
+	bool start_async;
 	int err, ret = 0;
 
 	spin_lock_irqsave(&dd->lock, flags);
@@ -904,10 +905,12 @@ static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
 
 	dd->areq = areq;
 	dd->ctx = ctx;
-	dd->is_async = (areq != new_areq);
+	start_async = (areq != new_areq);
+	dd->is_async = start_async;
 
+	/* WARNING: ctx->start() MAY change dd->is_async. */
 	err = ctx->start(dd);
-	return (dd->is_async) ? ret : err;
+	return (start_async) ? ret : err;
 }
 
 
-- 
2.7.4