Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

Pull rdma fixes from Jason Gunthorpe:
 "A small set of late-rc patches, mostly fixes for various crashers,
  some syzkaller fixes and a mlx5 HW limitation:

   - Several MAINTAINERS updates

   - Memory leak regression in ODP

   - Several fixes for syzkaller related crashes. Google recently taught
     syzkaller to create the software RDMA devices

   - Crash fixes for HFI1

   - Several fixes for mlx5 crashes

   - Prevent unprivileged access to an unsafe mlx5 HW resource"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
  RDMA/mlx5: Block delay drop to unprivileged users
  RDMA/mlx5: Fix access to wrong pointer while performing flush due to error
  RDMA/core: Ensure security pkey modify is not lost
  MAINTAINERS: Clean RXE section and add Zhu as RXE maintainer
  IB/hfi1: Ensure pq is not left on waitlist
  IB/rdmavt: Free kernel completion queue when done
  RDMA/mad: Do not crash if the rdma device does not have a umad interface
  RDMA/core: Fix missing error check on dev_set_name()
  RDMA/nl: Do not permit empty devices names during RDMA_NLDEV_CMD_NEWLINK/SET
  RDMA/mlx5: Fix the number of hwcounters of a dynamic counter
  MAINTAINERS: Update maintainers for HISILICON ROCE DRIVER
  RDMA/odp: Fix leaking the tgid for implicit ODP

1 files changed, 22 insertions, 3 deletions

diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c
index c2f0d9ba93de..13e4203497b3 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.c
+++ b/drivers/infiniband/hw/hfi1/user_sdma.c
@@ -141,6 +141,7 @@ static int defer_packet_queue(
 	 */
 	xchg(&pq->state, SDMA_PKT_Q_DEFERRED);
 	if (list_empty(&pq->busy.list)) {
+		pq->busy.lock = &sde->waitlock;
 		iowait_get_priority(&pq->busy);
 		iowait_queue(pkts_sent, &pq->busy, &sde->dmawait);
 	}
@@ -155,6 +156,7 @@ static void activate_packet_queue(struct iowait *wait, int reason)
 {
 	struct hfi1_user_sdma_pkt_q *pq =
 		container_of(wait, struct hfi1_user_sdma_pkt_q, busy);
+	pq->busy.lock = NULL;
 	xchg(&pq->state, SDMA_PKT_Q_ACTIVE);
 	wake_up(&wait->wait_dma);
 };
@@ -256,6 +258,21 @@ pq_reqs_nomem:
 	return ret;
 }
 
+static void flush_pq_iowait(struct hfi1_user_sdma_pkt_q *pq)
+{
+	unsigned long flags;
+	seqlock_t *lock = pq->busy.lock;
+
+	if (!lock)
+		return;
+	write_seqlock_irqsave(lock, flags);
+	if (!list_empty(&pq->busy.list)) {
+		list_del_init(&pq->busy.list);
+		pq->busy.lock = NULL;
+	}
+	write_sequnlock_irqrestore(lock, flags);
+}
+
 int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
 			       struct hfi1_ctxtdata *uctxt)
 {
@@ -281,6 +298,7 @@ int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
 		kfree(pq->reqs);
 		kfree(pq->req_in_use);
 		kmem_cache_destroy(pq->txreq_cache);
+		flush_pq_iowait(pq);
 		kfree(pq);
 	} else {
 		spin_unlock(&fd->pq_rcu_lock);
@@ -587,11 +605,12 @@ int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
 		if (ret < 0) {
 			if (ret != -EBUSY)
 				goto free_req;
-			wait_event_interruptible_timeout(
+			if (wait_event_interruptible_timeout(
 				pq->busy.wait_dma,
-				(pq->state == SDMA_PKT_Q_ACTIVE),
+				pq->state == SDMA_PKT_Q_ACTIVE,
 				msecs_to_jiffies(
-					SDMA_IOWAIT_TIMEOUT));
+					SDMA_IOWAIT_TIMEOUT)) <= 0)
+				flush_pq_iowait(pq);
 		}
 	}
 	*count += idx;