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Subject[PATCH 4.9 059/138] irqchip/gic-v3: Fix ppi-partitions lookup
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@kernel.org>

commit 00ee9a1ca5080202bc37b44e998c3b2c74d45817 upstream.

Fix child-node lookup during initialisation, which 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 gic node was prematurely freed, while
the ppi-partitions node was leaked.

Fixes: e3825ba1af3a ("irqchip/gic-v3: Add support for partitioned PPIs")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/irqchip/irq-gic-v3.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1022,18 +1022,18 @@ static void __init gic_populate_ppi_part
int nr_parts;
struct partition_affinity *parts;

- parts_node = of_find_node_by_name(gic_node, "ppi-partitions");
+ parts_node = of_get_child_by_name(gic_node, "ppi-partitions");
if (!parts_node)
return;

nr_parts = of_get_child_count(parts_node);

if (!nr_parts)
- return;
+ goto out_put_node;

parts = kzalloc(sizeof(*parts) * nr_parts, GFP_KERNEL);
if (WARN_ON(!parts))
- return;
+ goto out_put_node;

for_each_child_of_node(parts_node, child_part) {
struct partition_affinity *part;
@@ -1100,6 +1100,9 @@ static void __init gic_populate_ppi_part

gic_data.ppi_descs[i] = desc;
}
+
+out_put_node:
+ of_node_put(parts_node);
}

static void __init gic_of_setup_kvm_info(struct device_node *node)

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