NVMe: add ->exit_hctx() hook

If we do teardown and setup of the queue and block related parts
of the driver, then we should clear nvmeq->hctx once we kill the
hardware queue.

Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 9310fe5..ba278ae 100644 (file)
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -171,6 +171,13 @@ static int nvme_admin_init_request(void *data, struct request *req,
        return 0;
 }
 
+static void nvme_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
+{
+       struct nvme_queue *nvmeq = hctx->driver_data;
+
+       nvmeq->hctx = NULL;
+}
+
 static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
                          unsigned int hctx_idx)
 {
@@ -1335,6 +1342,7 @@ static struct blk_mq_ops nvme_mq_admin_ops = {
        .queue_rq       = nvme_admin_queue_rq,
        .map_queue      = blk_mq_map_queue,
        .init_hctx      = nvme_admin_init_hctx,
+       .exit_hctx      = nvme_exit_hctx,
        .init_request   = nvme_admin_init_request,
        .timeout        = nvme_timeout,
 };
@@ -1343,6 +1351,7 @@ static struct blk_mq_ops nvme_mq_ops = {
        .queue_rq       = nvme_queue_rq,
        .map_queue      = blk_mq_map_queue,
        .init_hctx      = nvme_init_hctx,
+       .exit_hctx      = nvme_exit_hctx,
        .init_request   = nvme_init_request,
        .timeout        = nvme_timeout,
 };