Commit c37406e0 authored Feb 26, 2018 by Christian König Committed by Bjorn Helgaas Feb 26, 2018

PCI: Allow release of resources that were never assigned



It is entirely possible that the BIOS wasn't able to assign resources to a
device. In this case don't crash in pci_release_resource() when we try to
resize the resource.

Fixes: 8bb705e3 ("PCI: Add pci_resize_resource() for resizing BARs")
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
CC: stable@vger.kernel.org	# v4.15+

parent 6d516d67

drivers/pci/setup-res.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -401,6 +401,10 @@ void pci_release_resource(struct pci_dev *dev, int resno)
		struct resource *res = dev->resource + resno;

		pci_info(dev, "BAR %d: releasing %pR\n", resno, res);

		if (!res->parent)
		return;

		release_resource(res);
		res->end = resource_size(res) - 1;
		res->start = 0;

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