virtio_ring: rename dma_handle to map_handle

Following patch will introduce virtio map operations which means the
address is not necessarily used for DMA. Let's rename the dma_handle
to map_handle first.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20250821064641.5025-6-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>

Author: jasowang

drivers/virtio/virtio_ring.c

@@ -305,18 +305,18 @@ size_t virtio_max_dma_size(const struct virtio_device *vdev)
 EXPORT_SYMBOL_GPL(virtio_max_dma_size);
 
 static void *vring_alloc_queue(struct virtio_device *vdev, size_t size,
-			       dma_addr_t *dma_handle, gfp_t flag,
+			       dma_addr_t *map_handle, gfp_t flag,
 			       union virtio_map map)
 {
 	if (vring_use_map_api(vdev)) {
 		return dma_alloc_coherent(map.dma_dev, size,
-					  dma_handle, flag);
+					  map_handle, flag);
 	} else {
 		void *queue = alloc_pages_exact(PAGE_ALIGN(size), flag);
 
 		if (queue) {
 			phys_addr_t phys_addr = virt_to_phys(queue);
-			*dma_handle = (dma_addr_t)phys_addr;
+			*map_handle = (dma_addr_t)phys_addr;
 
 			/*
 			 * Sanity check: make sure we dind't truncate
@@ -329,7 +329,7 @@ static void *vring_alloc_queue(struct virtio_device *vdev, size_t size,
 			 * warning and abort if we end up with an
 			 * unrepresentable address.
 			 */
-			if (WARN_ON_ONCE(*dma_handle != phys_addr)) {
+			if (WARN_ON_ONCE(*map_handle != phys_addr)) {
 				free_pages_exact(queue, PAGE_ALIGN(size));
 				return NULL;
 			}
@@ -339,11 +339,11 @@ static void *vring_alloc_queue(struct virtio_device *vdev, size_t size,
 }
 
 static void vring_free_queue(struct virtio_device *vdev, size_t size,
-			     void *queue, dma_addr_t dma_handle,
+			     void *queue, dma_addr_t map_handle,
 			     union virtio_map map)
 {
 	if (vring_use_map_api(vdev))
-		dma_free_coherent(map.dma_dev, size, queue, dma_handle);
+		dma_free_coherent(map.dma_dev, size, queue, map_handle);
 	else
 		free_pages_exact(queue, PAGE_ALIGN(size));
 }