linux-kernel - [PATCH 4.16 104/161] crypto: inside-secure - do not overwrite the threshold value

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Date:   Thu, 24 May 2018 11:38:49 +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, Ofer Heifetz <oferh@...vell.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.16 104/161] crypto: inside-secure - do not overwrite the threshold value

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

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

From: Antoine Tenart <antoine.tenart@...tlin.com>

[ Upstream commit e1d24c0bb76648cdf789b168defb6e31adb0b1b1 ]

This patch fixes the Inside Secure SafeXcel driver not to overwrite the
interrupt threshold value. In certain cases the value of this register,
which controls when to fire an interrupt, was overwritten. This lead to
packet not being processed or acked as the driver never was aware of
their completion.

This patch fixes this behaviour by not setting the threshold when
requests are being processed by the engine.

Fixes: dc7e28a3286e ("crypto: inside-secure - dequeue all requests at once")
Suggested-by: Ofer Heifetz <oferh@...vell.com>
Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/crypto/inside-secure/safexcel.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/crypto/inside-secure/safexcel.c
+++ b/drivers/crypto/inside-secure/safexcel.c
@@ -523,8 +523,7 @@ finalize:
 
 	if (!priv->ring[ring].busy) {
 		nreq -= safexcel_try_push_requests(priv, ring, nreq);
-		if (nreq)
-			priv->ring[ring].busy = true;
+		priv->ring[ring].busy = true;
 	}
 
 	priv->ring[ring].requests_left += nreq;