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PCI: mvebu: Check that PCI bridge specified in DT has function number zero

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Driver cannot handle PCI bridges at non-zero function address. So add
appropriate check. Currently all in-tree kernel DTS files set PCI bridge
function to zero.

Link: https://lore.kernel.org/r/20211125124605.25915-4-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Pali Rohár 2021-11-25 13:45:53 +01:00 committed by Lorenzo Pieralisi
parent 5d18d702e5
commit 489bfc5187
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/controller/pci-mvebu.c
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@ -845,6 +845,11 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie,
port->devfn = of_pci_get_devfn(child);
if (port->devfn < 0)
goto skip;
if (PCI_FUNC(port->devfn) != 0) {
dev_err(dev, "%s: invalid function number, must be zero\n",
port->name);
goto skip;
}
ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM,
&port->mem_target, &port->mem_attr);