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| author | Bjorn Helgaas <bhelgaas@google.com> | 2023-02-22 13:47:26 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2023-02-22 13:47:26 -0600 |
| commit | 7260675a52a67f3c44036306bf25f6947c294a02 (patch) | |
| tree | f0415c0586610078f13823baded1de1e75042c98 /drivers/pci | |
| parent | 881766fe0d4a8db9d885864afdfe44a5ea8d2c53 (diff) | |
| parent | 6606f4c3c48c7a75b13816266d3ea562eeec0b44 (diff) | |
Merge branch 'pci/p2pdma'
- Annotate RCU dereference (Logan Gunthorpe)
* pci/p2pdma:
PCI/P2PDMA: Annotate RCU dereference
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/p2pdma.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 86812d2073ea..9e8205572830 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -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); } |