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Commit 3306e99e authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/peer-to-peer' 

  - Prevent drivers that use dma_virt_ops from using peer-to-peer DMA
    (Logan Gunthorpe)

* pci/peer-to-peer:
  PCI/P2PDMA: Fix missing check for dma_virt_ops
parents e0997728 9c002bb6

drivers/pci/p2pdma.c

+9 −1
Original line number Diff line number Diff line
@@ -468,6 +468,14 @@ int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients, 
		return -1;



	for (i = 0; i < num_clients; i++) {

		if (IS_ENABLED(CONFIG_DMA_VIRT_OPS) &&

		    clients[i]->dma_ops == &dma_virt_ops) {

			if (verbose)

				dev_warn(clients[i],

					 "cannot be used for peer-to-peer DMA because the driver makes use of dma_virt_ops\n");

			return -1;

		}



		pci_client = find_parent_pci_dev(clients[i]);

		if (!pci_client) {

			if (verbose)
@@ -732,7 +740,7 @@ int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, int nents, 
	 * p2pdma mappings are not compatible with devices that use

	 * dma_virt_ops. If the upper layers do the right thing

	 * this should never happen because it will be prevented

	 * by the check in pci_p2pdma_add_client()

	 * by the check in pci_p2pdma_distance_many()

	 */

	if (WARN_ON_ONCE(IS_ENABLED(CONFIG_DMA_VIRT_OPS) &&

			 dev->dma_ops == &dma_virt_ops))