[PATCH v2 3/5] s390/vfio-ap: Ignore duplicate link requests in vfio_ap_mdev_link_queue

Jason J. Herne
2024-03-06T14:08:51Z

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