[PATCH] nvme-rdma: do not try to stop unallocated queues

[Maurizio Lombardi]

Trying to stop a queue which hasn't been allocated will result
in a warning due to calling mutex_lock() against an uninitialized mutex.

 DEBUG_LOCKS_WARN_ON(lock->magic != lock)
 WARNING: CPU: 4 PID: 104150 at kernel/locking/mutex.c:579

 Call trace:
  RIP: 0010:__mutex_lock+0x1173/0x14a0
  nvme_rdma_stop_queue+0x1b/0xa0 [nvme_rdma]
  nvme_rdma_teardown_io_queues.part.0+0xb0/0x1d0 [nvme_rdma]
  nvme_rdma_delete_ctrl+0x50/0x100 [nvme_rdma]
  nvme_do_delete_ctrl+0x149/0x158 [nvme_core]

Signed-off-by: Maurizio Lombardi <mlombard at redhat.com>
---
 drivers/nvme/host/rdma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index d433b2ec07a6..00b13336125e 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -638,6 +638,9 @@ static void __nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 
 static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
 {
+	if (!test_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags))
+		return;
+
 	mutex_lock(&queue->queue_lock);
 	if (test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
 		__nvme_rdma_stop_queue(queue);
-- 
2.39.3