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Merge branch 'pci/p2pdma'

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- Annotate RCU dereference (Logan Gunthorpe)

* pci/p2pdma:
  PCI/P2PDMA: Annotate RCU dereference
This commit is contained in:
Bjorn Helgaas
2023-02-22 13:47:26 -06:00
parent 881766fe0d 6606f4c3c4
commit 7260675a52
1 changed files with 5 additions and 3 deletions
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8
drivers/pci/p2pdma.c
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@@ -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);
}