diff options
| author | Sumit Semwal <sumit.semwal@linaro.org> | 2017-03-25 21:48:10 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-30 09:35:19 +0200 |
| commit | d4f09ea7e35c02a765f58e900fbc159ff00c70e2 (patch) | |
| tree | 98660c6d5033d9ba31efb16f5579e59029e590fa /drivers | |
| parent | 131f7969048b8ede0be57f64930e9ef8fee0c53b (diff) | |
PCI: Update BARs using property bits appropriate for type
From: Bjorn Helgaas <bhelgaas@google.com>
[ Upstream commit 45d004f4afefdd8d79916ee6d97a9ecd94bb1ffe ]
The BAR property bits (0-3 for memory BARs, 0-1 for I/O BARs) are supposed
to be read-only, but we do save them in res->flags and include them when
updating the BAR.
Mask the I/O property bits with ~PCI_BASE_ADDRESS_IO_MASK (0x3) instead of
PCI_REGION_FLAG_MASK (0xf) to make it obvious that we can't corrupt bits
2-3 of I/O addresses.
Use PCI_ROM_ADDRESS_MASK for ROM BARs. This means we'll only check the top
21 bits (instead of the 28 bits we used to check) of a ROM BAR to see if
the update was successful.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/setup-res.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index d1ba5e0067c5..032a6b1ea512 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -58,12 +58,17 @@ static void pci_std_update_resource(struct pci_dev *dev, int resno) return; pcibios_resource_to_bus(dev->bus, ®ion, res); + new = region.start; - new = region.start | (res->flags & PCI_REGION_FLAG_MASK); - if (res->flags & IORESOURCE_IO) + if (res->flags & IORESOURCE_IO) { mask = (u32)PCI_BASE_ADDRESS_IO_MASK; - else + new |= res->flags & ~PCI_BASE_ADDRESS_IO_MASK; + } else if (resno == PCI_ROM_RESOURCE) { + mask = (u32)PCI_ROM_ADDRESS_MASK; + } else { mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; + new |= res->flags & ~PCI_BASE_ADDRESS_MEM_MASK; + } if (resno < PCI_ROM_RESOURCE) { reg = PCI_BASE_ADDRESS_0 + 4 * resno; |