4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nicholas Mc Guire <hofrat@xxxxxxxxx>
[ Upstream commit 9f30b5ae0585ca5234fe979294b8f897299dec99 ]
of_iomap() can return NULL which seems critical here and thus should be
explicitly flagged so that the cause of system halting can be understood.
As of_find_compatible_node() is returning a device node with refcount
incremented it must be explicitly decremented here.
Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx>
Fixes: commit 7fda91e73155 ("ARM: hisi: enable smp for HiP01")
Signed-off-by: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-hisi/hotplug.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/arm/mach-hisi/hotplug.c
+++ b/arch/arm/mach-hisi/hotplug.c
@@ -226,10 +226,10 @@ void hip01_set_cpu(int cpu, bool enable)
if (!ctrl_base) {
np = of_find_compatible_node(NULL, NULL, "hisilicon,hip01-sysctrl");
- if (np)
- ctrl_base = of_iomap(np, 0);
- else
- BUG();
+ BUG_ON(!np);
+ ctrl_base = of_iomap(np, 0);
+ of_node_put(np);
+ BUG_ON(!ctrl_base);
}
if (enable) {
