linux-kernel - [PATCH] crypto: engine: disable BH during completion

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Date:   Thu, 27 Jan 2022 13:33:32 +0000
From:   Corentin Labbe <clabbe@...libre.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Corentin Labbe <clabbe@...libre.com>
Subject: [PATCH] crypto: engine: disable BH during completion

When doing iperf over ipsec with crypto hardware sun8i-ce, I hit some
spinlock recursion bug.

This is due to crypto/crypto_engine not disabling BH when calling
completion function.

Fixes: 735d37b5424b ("crypto: engine - Introduce the block request crypto engine framework")
Signed-off-by: Corentin Labbe <clabbe@...libre.com>
---
 crypto/crypto_engine.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
index fb07da9920ee..b3844f6d98a3 100644
--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -7,6 +7,7 @@
  * Author: Baolin Wang <baolin.wang@...aro.org>
  */
 
+#include <linux/bottom_half.h>
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/device.h>
@@ -53,7 +54,9 @@ static void crypto_finalize_request(struct crypto_engine *engine,
 				dev_err(engine->dev, "failed to unprepare request\n");
 		}
 	}
+	local_bh_disable();
 	req->complete(req, err);
+	local_bh_enable();
 
 	kthread_queue_work(engine->kworker, &engine->pump_requests);
 }
-- 
2.34.1