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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: 8bb705e3e7 ("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+
This commit is contained in:
Christian König 2018-02-26 14:51:13 -06:00 committed by Bjorn Helgaas
parent 6d516d6798
commit c37406e05d
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/setup-res.c
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@ -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;