[PATCH v4 04/10] crypto: hisilicon/qm - fix judgement of queue is full

[Yang Shen]

From: Hui Tang <tanghui20@xxxxxxxxxx>

The queue depth is 1024, so the condition for judging the queue full
should be 1023, otherwise the hardware cannot judge whether the queue
is empty or full.

Fixes: 263c9959c937("crypto: hisilicon - add queue management driver...")
Signed-off-by: Hui Tang <tanghui20@xxxxxxxxxx>
Signed-off-by: Yang Shen <shenyang39@xxxxxxxxxx>
Reviewed-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
---
 drivers/crypto/hisilicon/qm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 406fca3..9a5a114 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -1646,7 +1646,7 @@ static void *qm_get_avail_sqe(struct hisi_qp *qp)
 	struct hisi_qp_status *qp_status = &qp->qp_status;
 	u16 sq_tail = qp_status->sq_tail;
 
-	if (unlikely(atomic_read(&qp->qp_status.used) == QM_Q_DEPTH))
+	if (unlikely(atomic_read(&qp->qp_status.used) == QM_Q_DEPTH - 1))
 		return NULL;
 
 	return qp->sqe + sq_tail * qp->qm->sqe_size;
-- 
2.7.4