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PCI/P2PDMA: Finish RCU conversion of pdev->p2pdma

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While looking at pci_alloc_p2pmem() I found RCU protection was not properly
applied there, as pdev->p2pdma was potentially read multiple times.

Fix pci_alloc_p2pmem(), add __rcu qualifier to p2pdma field of struct
pci_dev, and fix all other accesses to this field with proper RCU verbs.

Link: https://lore.kernel.org/r/20210701095621.3129283-1-eric.dumazet@gmail.com
Fixes: 1570175abd ("PCI/P2PDMA: track pgmap references per resource, not globally")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
This commit is contained in:
Eric Dumazet
2021-07-01 16:48:23 -05:00
committed by Bjorn Helgaas
parent d1b8dc09dd
commit ae21f835a5
2 changed files with 73 additions and 26 deletions
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2
include/linux/pci.h
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@@ -497,7 +497,7 @@ struct pci_dev {
u16 pasid_features;
#endif
#ifdef CONFIG_PCI_P2PDMA
struct pci_p2pdma *p2pdma;
struct pci_p2pdma __rcu *p2pdma;
#endif
u16 acs_cap; /* ACS Capability offset */
phys_addr_t rom; /* Physical address if not from BAR */