releases/5.4.232/ionic-clean-interrupt-before-enabling-queue-to-avoid.patch

From 367758ac450bc1a67c6ec7838b695486f90aa379 Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Thu, 2 Feb 2023 13:55:35 -0800
Subject: ionic: clean interrupt before enabling queue to avoid credit race

From: Neel Patel <neel.patel@amd.com>

[ Upstream commit e8797a058466b60fc5a3291b92430c93ba90eaff ]

Clear the interrupt credits before enabling the queue rather
than after to be sure that the enabled queue starts at 0 and
that we don't wipe away possible credits after enabling the
queue.

Fixes: 0f3154e6bcb3 ("ionic: Add Tx and Rx handling")
Signed-off-by: Neel Patel <neel.patel@amd.com>
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index f9c303d76658a..d0841836cf705 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -190,6 +190,7 @@ static int ionic_qcq_enable(struct ionic_qcq *qcq)
 			.oper = IONIC_Q_ENABLE,
 		},
 	};
+	int ret;
 
 	idev = &lif->ionic->idev;
 	dev = lif->ionic->dev;
@@ -197,16 +198,24 @@ static int ionic_qcq_enable(struct ionic_qcq *qcq)
 	dev_dbg(dev, "q_enable.index %d q_enable.qtype %d\n",
 		ctx.cmd.q_control.index, ctx.cmd.q_control.type);
 
+	if (qcq->flags & IONIC_QCQ_F_INTR)
+		ionic_intr_clean(idev->intr_ctrl, qcq->intr.index);
+
+	ret = ionic_adminq_post_wait(lif, &ctx);
+	if (ret)
+		return ret;
+
+	if (qcq->napi.poll)
+		napi_enable(&qcq->napi);
+
 	if (qcq->flags & IONIC_QCQ_F_INTR) {
 		irq_set_affinity_hint(qcq->intr.vector,
 				      &qcq->intr.affinity_mask);
-		napi_enable(&qcq->napi);
-		ionic_intr_clean(idev->intr_ctrl, qcq->intr.index);
 		ionic_intr_mask(idev->intr_ctrl, qcq->intr.index,
 				IONIC_INTR_MASK_CLEAR);
 	}
 
-	return ionic_adminq_post_wait(lif, &ctx);
+	return 0;
 }
 
 static int ionic_qcq_disable(struct ionic_qcq *qcq)
-- 
2.39.0