PCI: mvebu: Check for valid ports

Some mvebu ports do not have to be initialized. So skip these uninitialized
mvebu ports in every port iteration function to prevent access to unmapped
memory or dereferencing NULL pointers. Uninitialized mvebu port has base
address set to NULL.

Link: https://lore.kernel.org/r/20211125124605.25915-2-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index f2180e4630a1bf1bfbea178a9174f4609fea976c..51cf3ecb4121bd71dba3a9a3bfdae8c7679e52e5 100644 (file)
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -606,6 +606,9 @@ static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie,
        for (i = 0; i < pcie->nports; i++) {
                struct mvebu_pcie_port *port = &pcie->ports[i];
 
+               if (!port->base)
+                       continue;
+
                if (bus->number == 0 && port->devfn == devfn)
                        return port;
                if (bus->number != 0 &&
@@ -781,6 +784,8 @@ static int mvebu_pcie_suspend(struct device *dev)
        pcie = dev_get_drvdata(dev);
        for (i = 0; i < pcie->nports; i++) {
                struct mvebu_pcie_port *port = pcie->ports + i;
+               if (!port->base)
+                       continue;
                port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF);
        }
 
@@ -795,6 +800,8 @@ static int mvebu_pcie_resume(struct device *dev)
        pcie = dev_get_drvdata(dev);
        for (i = 0; i < pcie->nports; i++) {
                struct mvebu_pcie_port *port = pcie->ports + i;
+               if (!port->base)
+                       continue;
                mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF);
                mvebu_pcie_setup_hw(port);
        }