From 4b24ea971a93f5d0bec34bf7bfd0939f70cfaae6 Mon Sep 17 00:00:00 2001
From: Vishnu Suresh <Vishnu@freescale.com>
Date: Mon, 20 Oct 2008 21:06:18 +0800
Subject: crypto: talitos - Preempt overflow interrupts off-by-one fix

In commit ec6644d6325b5a38525f1d5b20fd4bf7db05cf2a "crypto: talitos - Preempt
overflow interrupts", the test in atomic_inc_not_zero was interpreted by the
author to be applied after the increment operation (not before). This off-by-one
fix prevents overflow error interrupts from occurring when requests are frequent
and large enough to do so.

Signed-off-by: Vishnu Suresh <Vishnu@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 16c97ca..c3df3b1 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1598,7 +1598,7 @@ static int talitos_probe(struct of_device *ofdev,
 		goto err_out;
 	}
 	for (i = 0; i < priv->num_channels; i++)
-		atomic_set(&priv->submit_count[i], -priv->chfifo_len);
+		atomic_set(&priv->submit_count[i], -(priv->chfifo_len - 1));
 
 	priv->head = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL);
 	priv->tail = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL);
-- 
cgit v0.10.2