From 05bd1beec2748d74cbc41ee476be2af0f91bd2d3 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Horia=20Geant=C4=83?= <horia.geanta@nxp.com>
Date: Mon, 11 Feb 2019 13:46:14 +0200
Subject: [PATCH] crypto: caam/qi2 - relax busy polling while enqueuing FDs
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Add cpu_relax() in the loop that tries to enqueue the FDs.

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 drivers/crypto/caam/caamalg_qi2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/crypto/caam/caamalg_qi2.c b/drivers/crypto/caam/caamalg_qi2.c
index 6a6a508f5fd2..c2c1abc68f81 100644
--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -5277,6 +5277,8 @@ int dpaa2_caam_enqueue(struct device *dev, struct caam_request *req)
 						  &fd);
 		if (err != -EBUSY)
 			break;
+
+		cpu_relax();
 	}
 
 	if (unlikely(err)) {
-- 
2.30.2