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| author |   Bjorn Helgaas <bhelgaas@google.com> | 2014-02-26 11:25:59 -0700 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-02-27 10:43:32 -0700 |
| commit | cd8a4d3657c3f2cf9ce3780707be1debb8fea6e2 (patch) | |
| tree | 76a9041b737f9f9620e9c4f2d1ba633fb792dcf2 /drivers/pci | |
| parent | PCI: Don't clear IORESOURCE_UNSET when updating BAR (diff) | |
| download | linux-dev-cd8a4d3657c3f2cf9ce3780707be1debb8fea6e2.tar.xz linux-dev-cd8a4d3657c3f2cf9ce3780707be1debb8fea6e2.zip | |
PCI: Check IORESOURCE_UNSET before updating BAR
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/setup-res.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 725d5b28398c..7f7652176fc5 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -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 |