6.6-stable review patch. If anyone has any objections, please let me know.
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From: Frank Li Frank.Li@nxp.com
[ Upstream commit f3e1dccba0a0833fc9a05fb838ebeb6ea4ca0e1a ]
Most systems' PCIe outbound map windows have non-zero physical addresses, but the possibility of encountering zero increased after following commit ("PCI: dwc: Use parent_bus_offset").
'ep->outbound_addr[n]', representing 'parent_bus_address', might be 0 on some hardware, which trims high address bits through bus fabric before sending to the PCIe controller.
Replace the iteration logic with 'for_each_set_bit()' to ensure only allocated map windows are iterated when determining the ATU index from a given address.
Link: https://lore.kernel.org/r/20250315201548.858189-12-helgaas@kernel.org Signed-off-by: Frank Li Frank.Li@nxp.com Signed-off-by: Bjorn Helgaas bhelgaas@google.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/dwc/pcie-designware-ep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c index f2e5feba55267..26ad643fb4248 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -281,7 +281,7 @@ static int dw_pcie_find_index(struct dw_pcie_ep *ep, phys_addr_t addr, u32 index; struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
- for (index = 0; index < pci->num_ob_windows; index++) { + for_each_set_bit(index, ep->ob_window_map, pci->num_ob_windows) { if (ep->outbound_addr[index] != addr) continue; *atu_index = index;