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Commit c37406e0 authored by Christian König's avatar Christian König Committed by Bjorn Helgaas
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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: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarAndy 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;