On Sun, May 30, 2021 at 11:06:28AM -0400, Tianyu Lan wrote:

+				for (i = 0; i < request->hvpg_count; i++)
+					dma_unmap_page(&device->device,
+							request->dma_range[i].dma,
+							request->dma_range[i].mapping_size,
+							request->vstor_packet.vm_srb.data_in
+							     == READ_TYPE ?
+							DMA_FROM_DEVICE : DMA_TO_DEVICE);
+				kfree(request->dma_range);

Unreadably long lines.  You probably want to factor the quoted code into
a little readable helper and do the same for the map side.