Received-SPF: pass (google.com: domain of linux-kernel+bounces-94023-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
From: "Jason J. Herne" <jjherne@linux.ibm.com>
To: linux-s390@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, pasic@linux.ibm.com, akrowiak@linux.ibm.com,
        borntraeger@de.ibm.com, agordeev@linux.ibm.com, gor@linux.ibm.com
Subject: [PATCH v2 3/5] s390/vfio-ap: Ignore duplicate link requests in vfio_ap_mdev_link_queue
Date: Wed,  6 Mar 2024 09:08:41 -0500
Message-ID: <20240306140843.10782-4-jjherne@linux.ibm.com>
In-Reply-To: <20240306140843.10782-1-jjherne@linux.ibm.com>
References: <20240306140843.10782-1-jjherne@linux.ibm.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

vfio_ap_mdev_link_queue is changed to detect if a matrix_mdev has
already linked the given queue. If so, it bails out.

Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
---
 drivers/s390/crypto/vfio_ap_ops.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index b1c1dc0233e1..259130347d00 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -781,10 +781,11 @@ static int vfio_ap_mdev_probe(struct mdev_device *mdev)
 static void vfio_ap_mdev_link_queue(struct ap_matrix_mdev *matrix_mdev,
 				    struct vfio_ap_queue *q)
 {
-	if (q) {
-		q->matrix_mdev = matrix_mdev;
-		hash_add(matrix_mdev->qtable.queues, &q->mdev_qnode, q->apqn);
-	}
+	if (!q || vfio_ap_mdev_get_queue(matrix_mdev, q->apqn))
+		return;
+
+	q->matrix_mdev = matrix_mdev;
+	hash_add(matrix_mdev->qtable.queues, &q->mdev_qnode, q->apqn);
 }
 
 static void vfio_ap_mdev_link_apqn(struct ap_matrix_mdev *matrix_mdev, int apqn)
-- 
2.41.0