PCI: iproc: Save host bridge window resource in struct iproc_pcie

The host bridge memory window resource is inserted into the iomem_resource
tree and cannot be deallocated until the host bridge itself is removed.

Previously, the window was on the stack, which meant the iomem_resource
entry pointed into the stack and was corrupted as soon as the probe
function returned, which caused memory corruption and errors like this:

  pcie_iproc_bcma bcma0:8: resource collision: [mem 0x40000000-0x47ffffff] conflicts with PCIe MEM space [mem 0x40000000-0x47ffffff]

Move the memory window resource from the stack into struct iproc_pcie so
its lifetime matches that of the host bridge.

Fixes: c3245a566400 ("PCI: iproc: Request host bridge window resources")
Reported-and-tested-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v4.8+

diff --git a/drivers/pci/host/pcie-iproc-bcma.c b/drivers/pci/host/pcie-iproc-bcma.c
index bd4c9ec..384c27e 100644 (file)
--- a/drivers/pci/host/pcie-iproc-bcma.c
+++ b/drivers/pci/host/pcie-iproc-bcma.c
@@ -44,8 +44,7 @@ static int iproc_pcie_bcma_probe(struct bcma_device *bdev)
 {
        struct device *dev = &bdev->dev;
        struct iproc_pcie *pcie;
-       LIST_HEAD(res);
-       struct resource res_mem;
+       LIST_HEAD(resources);
        int ret;
 
        pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
@@ -63,22 +62,23 @@ static int iproc_pcie_bcma_probe(struct bcma_device *bdev)
 
        pcie->base_addr = bdev->addr;
 
-       res_mem.start = bdev->addr_s[0];
-       res_mem.end = bdev->addr_s[0] + SZ_128M - 1;
-       res_mem.name = "PCIe MEM space";
-       res_mem.flags = IORESOURCE_MEM;
-       pci_add_resource(&res, &res_mem);
+       pcie->mem.start = bdev->addr_s[0];
+       pcie->mem.end = bdev->addr_s[0] + SZ_128M - 1;
+       pcie->mem.name = "PCIe MEM space";
+       pcie->mem.flags = IORESOURCE_MEM;
+       pci_add_resource(&resources, &pcie->mem);
 
        pcie->map_irq = iproc_pcie_bcma_map_irq;
 
-       ret = iproc_pcie_setup(pcie, &res);
-       if (ret)
+       ret = iproc_pcie_setup(pcie, &resources);
+       if (ret) {
                dev_err(dev, "PCIe controller setup failed\n");
-
-       pci_free_resource_list(&res);
+               pci_free_resource_list(&resources);
+               return ret;
+       }
 
        bcma_set_drvdata(bdev, pcie);
-       return ret;
+       return 0;
 }
 
 static void iproc_pcie_bcma_remove(struct bcma_device *bdev)

diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
index f4909bb..8c6a327 100644 (file)
--- a/drivers/pci/host/pcie-iproc-platform.c
+++ b/drivers/pci/host/pcie-iproc-platform.c
@@ -51,7 +51,7 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
        struct device_node *np = dev->of_node;
        struct resource reg;
        resource_size_t iobase = 0;
-       LIST_HEAD(res);
+       LIST_HEAD(resources);
        int ret;
 
        pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
@@ -96,10 +96,10 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
                pcie->phy = NULL;
        }
 
-       ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &iobase);
+       ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &resources,
+                                              &iobase);
        if (ret) {
-               dev_err(dev,
-                       "unable to get PCI host bridge resources\n");
+               dev_err(dev, "unable to get PCI host bridge resources\n");
                return ret;
        }
 
@@ -112,14 +112,15 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
                pcie->map_irq = of_irq_parse_and_map_pci;
        }
 
-       ret = iproc_pcie_setup(pcie, &res);
-       if (ret)
+       ret = iproc_pcie_setup(pcie, &resources);
+       if (ret) {
                dev_err(dev, "PCIe controller setup failed\n");
-
-       pci_free_resource_list(&res);
+               pci_free_resource_list(&resources);
+               return ret;
+       }
 
        platform_set_drvdata(pdev, pcie);
-       return ret;
+       return 0;
 }
 
 static int iproc_pcie_pltfm_remove(struct platform_device *pdev)

diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
index 04fed8e..0bbe2ea 100644 (file)
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -90,6 +90,7 @@ struct iproc_pcie {
 #ifdef CONFIG_ARM
        struct pci_sys_data sysdata;
 #endif
+       struct resource mem;
        struct pci_bus *root_bus;
        struct phy *phy;
        int (*map_irq)(const struct pci_dev *, u8, u8);