Messages in this thread Patch in this message | | | From | Niklas Cassel <> | Subject | [PATCH v3 3/3] PCI: designware-ep: Return an error when requesting a too large BAR size | Date | Tue, 27 Feb 2018 12:59:07 +0100 |
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pci_epc_set_bar() can be called with flag PCI_BASE_ADDRESS_MEM_TYPE_64, and can thus request a BAR size larger than 4 GB.
However, the pcie-designware-ep.c driver currently doesn't handle BAR sizes larger than 4 GB. (Since we are only writing the BAR_mask[x] register and not the BAR_mask[x+1] register.)
For now, return an error when requesting a BAR size larger than 4 GB.
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com> --- drivers/pci/dwc/pcie-designware-ep.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/pci/dwc/pcie-designware-ep.c b/drivers/pci/dwc/pcie-designware-ep.c index 3a6feeff5f5b..efb65a7c06b8 100644 --- a/drivers/pci/dwc/pcie-designware-ep.c +++ b/drivers/pci/dwc/pcie-designware-ep.c @@ -126,6 +126,11 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no, enum dw_pcie_as_type as_type; u32 reg = PCI_BASE_ADDRESS_0 + (4 * bar); + if (upper_32_bits(size)) { + dev_err(pci->dev, "can't handle BAR larger than 4GB\n"); + return -EINVAL; + } + if (!(flags & PCI_BASE_ADDRESS_SPACE)) as_type = DW_PCIE_AS_MEM; else -- 2.14.2
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