nvme: set max_hw_sectors unconditionally

All transports set a max_hw_sectors value in the nvme_ctrl, so make
the code using it unconditional and clean it up using a little helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>

Author: Christoph Hellwig

drivers/nvme/host/core.c

@@ -1944,19 +1944,19 @@ static int nvme_configure_metadata(struct nvme_ctrl *ctrl,
 	return 0;
 }
 
+static u32 nvme_max_drv_segments(struct nvme_ctrl *ctrl)
+{
+	return ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> SECTOR_SHIFT) + 1;
+}
+
 static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 		struct request_queue *q)
 {
 	bool vwc = ctrl->vwc & NVME_CTRL_VWC_PRESENT;
 
-	if (ctrl->max_hw_sectors) {
-		u32 max_segments =
-			(ctrl->max_hw_sectors / (NVME_CTRL_PAGE_SIZE >> 9)) + 1;
-
-		max_segments = min_not_zero(max_segments, ctrl->max_segments);
-		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
-		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
-	}
+	blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
+	blk_queue_max_segments(q, min_t(u32, USHRT_MAX,
+		min_not_zero(nvme_max_drv_segments(ctrl), ctrl->max_segments)));
 	blk_queue_virt_boundary(q, NVME_CTRL_PAGE_SIZE - 1);
 	blk_queue_dma_alignment(q, 3);
 	blk_queue_write_cache(q, vwc, vwc);