Commit 7260675a authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

Merge branch 'pci/p2pdma' 

- Annotate RCU dereference (Logan Gunthorpe)

* pci/p2pdma:
  PCI/P2PDMA: Annotate RCU dereference
parents 881766fe 6606f4c3

drivers/pci/p2pdma.c

+5 −3
Original line number Diff line number Diff line
@@ -194,11 +194,13 @@ static const struct attribute_group p2pmem_group = { 
static void p2pdma_page_free(struct page *page)

{

	struct pci_p2pdma_pagemap *pgmap = to_p2p_pgmap(page->pgmap);

	/* safe to dereference while a reference is held to the percpu ref */

	struct pci_p2pdma *p2pdma =

		rcu_dereference_protected(pgmap->provider->p2pdma, 1);

	struct percpu_ref *ref;



	gen_pool_free_owner(pgmap->provider->p2pdma->pool,

			    (uintptr_t)page_to_virt(page), PAGE_SIZE,

			    (void **)&ref);

	gen_pool_free_owner(p2pdma->pool, (uintptr_t)page_to_virt(page),

			    PAGE_SIZE, (void **)&ref);

	percpu_ref_put(ref);

}