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PCI/P2PDMA: fix the gen_pool_add_virt() failure path
The pci_p2pdma_add_resource() implementation immediately frees the pgmap
if gen_pool_add_virt() fails. However, that means that when @dev
triggers a devres release devm_memremap_pages_release() will crash
trying to access the freed @pgmap.
Use the new devm_memunmap_pages() to manually free the mapping in the
error path.
Link: http://lkml.kernel.org/r/155727337603.292046.13101332703665246702.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Fixes: 52916982af
("PCI/P2PDMA: Support peer-to-peer memory")
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
2e3f139e8e
commit
e615a19121
@ -208,13 +208,15 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
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pci_bus_address(pdev, bar) + offset,
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resource_size(&pgmap->res), dev_to_node(&pdev->dev));
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if (error)
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goto pgmap_free;
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goto pages_free;
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pci_info(pdev, "added peer-to-peer DMA memory %pR\n",
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&pgmap->res);
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return 0;
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pages_free:
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devm_memunmap_pages(&pdev->dev, pgmap);
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pgmap_free:
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devm_kfree(&pdev->dev, pgmap);
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return error;
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