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PCI: Check IORESOURCE_UNSET before updating BAR

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Check to make sure we don't update a BAR with an address we haven't
assigned.

If we haven't assigned an address to a resource, we shouldn't write it to a
BAR.  This isn't a problem for the usual path via pci_assign_resource(),
which clears IORESOURCE_UNSET before calling pci_update_resource(), but
paths like pci_restore_bars() can call this for resources we haven't
assigned.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2014-02-26 11:25:59 -07:00
parent 434aafc1ae
commit cd8a4d3657
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/setup-res.c
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@ -44,6 +44,9 @@ void pci_update_resource(struct pci_dev *dev, int resno)
if (!res->flags)
return;
if (res->flags & IORESOURCE_UNSET)
return;
/*
* Ignore non-moveable resources. This might be legacy resources for
* which no functional BAR register exists or another important