affecting bug (device removal hang).
- Minimal, well-scoped change in a single driver.
- No new features or interface changes.
- Low risk of regression; guarded by existing locking and only active
  during removal.
- RDMA driver-local; no core subsystem impact.

Given the above, this is a strong candidate for backporting to relevant
stable kernels that contain the corresponding GSI/UD code paths.

 drivers/infiniband/hw/mana/cq.c      | 26 ++++++++++++++++++++++++++
 drivers/infiniband/hw/mana/device.c  |  3 +++
 drivers/infiniband/hw/mana/mana_ib.h |  3 +++
 3 files changed, 32 insertions(+)

diff --git a/drivers/infiniband/hw/mana/cq.c b/drivers/infiniband/hw/mana/cq.c
index 28e154bbb50f8..1becc87791235 100644
--- a/drivers/infiniband/hw/mana/cq.c
+++ b/drivers/infiniband/hw/mana/cq.c
@@ -291,6 +291,32 @@ static int mana_process_completions(struct mana_ib_cq *cq, int nwc, struct ib_wc
 	return wc_index;
 }
 
+void mana_drain_gsi_sqs(struct mana_ib_dev *mdev)
+{
+	struct mana_ib_qp *qp = mana_get_qp_ref(mdev, MANA_GSI_QPN, false);
+	struct ud_sq_shadow_wqe *shadow_wqe;
+	struct mana_ib_cq *cq;
+	unsigned long flags;
+
+	if (!qp)
+		return;
+
+	cq = container_of(qp->ibqp.send_cq, struct mana_ib_cq, ibcq);
+
+	spin_lock_irqsave(&cq->cq_lock, flags);
+	while ((shadow_wqe = shadow_queue_get_next_to_complete(&qp->shadow_sq))
+			!= NULL) {
+		shadow_wqe->header.error_code = IB_WC_GENERAL_ERR;
+		shadow_queue_advance_next_to_complete(&qp->shadow_sq);
+	}
+	spin_unlock_irqrestore(&cq->cq_lock, flags);
+
+	if (cq->ibcq.comp_handler)
+		cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
+
+	mana_put_qp_ref(qp);
+}
+
 int mana_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 {
 	struct mana_ib_cq *cq = container_of(ibcq, struct mana_ib_cq, ibcq);
diff --git a/drivers/infiniband/hw/mana/device.c b/drivers/infiniband/hw/mana/device.c
index fa60872f169f4..bdeddb642b877 100644
--- a/drivers/infiniband/hw/mana/device.c
+++ b/drivers/infiniband/hw/mana/device.c
@@ -230,6 +230,9 @@ static void mana_ib_remove(struct auxiliary_device *adev)
 {
 	struct mana_ib_dev *dev = dev_get_drvdata(&adev->dev);
 
+	if (mana_ib_is_rnic(dev))
+		mana_drain_gsi_sqs(dev);
+
 	ib_unregister_device(&dev->ib_dev);
 	dma_pool_destroy(dev->av_pool);
 	if (mana_ib_is_rnic(dev)) {
diff --git a/drivers/infiniband/hw/mana/mana_ib.h b/drivers/infiniband/hw/mana/mana_ib.h
index 5d31034ac7fb3..af09a3e6ccb78 100644
--- a/drivers/infiniband/hw/mana/mana_ib.h
+++ b/drivers/infiniband/hw/mana/mana_ib.h
@@ -43,6 +43,8 @@
  */
 #define MANA_AV_BUFFER_SIZE	64
 
+#define MANA_GSI_QPN		(1)
+
 struct mana_ib_adapter_caps {
 	u32 max_sq_id;
 	u32 max_rq_id;
@@ -718,6 +720,7 @@ int mana_ib_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
 int mana_ib_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
 		      const struct ib_send_wr **bad_wr);
 
+void mana_drain_gsi_sqs(struct mana_ib_dev *mdev);
 int mana_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc);
 int mana_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags);
 
-- 
2.51.0[PATCH AUTOSEL 6.17] RDMA/mana_ib: Drain send wrs of GSI QPSasha Levin <sashal@kernel.org> undefinedpatches@lists.linux.dev, stable@vger.kernel.org undefined undefined undefined undefined undefined undefinedÉ_ƒÇ$