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 (file)
--- 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);