Patch "PCI: keystone: Fix interrupt-controller-node lookup" has been added to the 4.4-stable tree

Patch "PCI: keystone: Fix interrupt-controller-node lookup" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    PCI: keystone: Fix interrupt-controller-node lookup

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pci-keystone-fix-interrupt-controller-node-lookup.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From eac56aa3bc8af3d9b9850345d0f2da9d83529134 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Fri, 17 Nov 2017 14:38:31 +0100
Subject: PCI: keystone: Fix interrupt-controller-node lookup

From: Johan Hovold <johan@kernel.org>

commit eac56aa3bc8af3d9b9850345d0f2da9d83529134 upstream.

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>
[johan: backport to 4.4]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/host/pci-keystone.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- 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_in
 	}
 
 	/* 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_in
 		if (!host_irqs[temp])
 			break;
 	}
+
+	of_node_put(*np_temp);
+
 	if (temp) {
 		*num_irqs = temp;
 		ret = 0;


Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.4/pci-keystone-fix-interrupt-controller-node-lookup.patch