From: Johan Hovold johan@kernel.org
This patch has been added to the 4.1 stable tree. If you have any objections, please let us know.
===============
[ Upstream commit eac56aa3bc8af3d9b9850345d0f2da9d83529134 ]
Fix child-node lookup during initialisation which was using the wrong OF-helper and ended up searching the whole device tree depth-first starting at the parent rather than just matching on its children.
To make things worse, the parent pci node could end up being prematurely freed as of_find_node_by_name() drops a reference to its first argument. Any matching child interrupt-controller node was also leaked.
Fixes: 0c4ffcfe1fbc ("PCI: keystone: Add TI Keystone PCIe driver") Cc: stable stable@vger.kernel.org # 3.18 Acked-by: Murali Karicheri m-karicheri2@ti.com Signed-off-by: Johan Hovold johan@kernel.org [lorenzo.pieralisi@arm.com: updated commit subject] Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- drivers/pci/host/pci-keystone.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c index 75333b0c4f0a..29b018c4e7e4 100644 --- a/drivers/pci/host/pci-keystone.c +++ b/drivers/pci/host/pci-keystone.c @@ -179,14 +179,16 @@ static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, }
/* interrupt controller is in a child node */ - *np_temp = of_find_node_by_name(np_pcie, controller); + *np_temp = of_get_child_by_name(np_pcie, controller); if (!(*np_temp)) { dev_err(dev, "Node for %s is absent\n", controller); goto out; } temp = of_irq_count(*np_temp); - if (!temp) + if (!temp) { + of_node_put(*np_temp); goto out; + } if (temp > max_host_irqs) dev_warn(dev, "Too many %s interrupts defined %u\n", (legacy ? "legacy" : "MSI"), temp); @@ -200,6 +202,9 @@ static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie, if (!host_irqs[temp]) break; } + + of_node_put(*np_temp); + if (temp) { *num_irqs = temp; ret = 0;