With the inbound DMA mapping supported added, the iProc PCIe driver parses DT property "dma-ranges" through call to "of_pci_dma_range_parser_init". In the case of BCMA, this results in a NULL pointer deference due to a missing of_node.
Fix this by adding a guard in pcie-iproc-platform.c to only enable the inbound DMA mapping logic when DT property "dma-ranges" is present
Fixes: dd9d4e7498de3 ("PCI: iproc: Add inbound DMA mapping support") Reported-by: Rafał Miłecki rafal@milecki.pl Signed-off-by: Ray Jui ray.jui@broadcom.com Tested-by: Rafał Miłecki rafal@milecki.pl cc: stable@vger.kernel.org # 4.10+ --- drivers/pci/host/pcie-iproc-platform.c | 7 +++++++ drivers/pci/host/pcie-iproc.c | 8 +++++--- drivers/pci/host/pcie-iproc.h | 2 ++ 3 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c index a5073a9..32228d4 100644 --- a/drivers/pci/host/pcie-iproc-platform.c +++ b/drivers/pci/host/pcie-iproc-platform.c @@ -92,6 +92,13 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev) pcie->need_ob_cfg = true; }
+ /* + * DT nodes are not used by all platforms that use the iProc PCIe + * core driver. For platforms that require explict inbound mapping + * configuration, "dma-ranges" would have been present in DT + */ + pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges"); + /* PHY use is optional */ pcie->phy = devm_phy_get(dev, "pcie-phy"); if (IS_ERR(pcie->phy)) { diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c index 935909b..7583606 100644 --- a/drivers/pci/host/pcie-iproc.c +++ b/drivers/pci/host/pcie-iproc.c @@ -1378,9 +1378,11 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res) } }
- ret = iproc_pcie_map_dma_ranges(pcie); - if (ret && ret != -ENOENT) - goto err_power_off_phy; + if (pcie->need_ib_cfg) { + ret = iproc_pcie_map_dma_ranges(pcie); + if (ret && ret != -ENOENT) + goto err_power_off_phy; + }
#ifdef CONFIG_ARM pcie->sysdata.private_data = pcie; diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h index a6b55ce..4ac6282 100644 --- a/drivers/pci/host/pcie-iproc.h +++ b/drivers/pci/host/pcie-iproc.h @@ -74,6 +74,7 @@ struct iproc_msi; * @ob: outbound mapping related parameters * @ob_map: outbound mapping related parameters specific to the controller * + * @need_ib_cfg: indicates SW needs to configure the inbound mapping window * @ib: inbound mapping related parameters * @ib_map: outbound mapping region related parameters * @@ -101,6 +102,7 @@ struct iproc_pcie { struct iproc_pcie_ob ob; const struct iproc_pcie_ob_map *ob_map;
+ bool need_ib_cfg; struct iproc_pcie_ib ib; const struct iproc_pcie_ib_map *ib_map;