4.4-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Mc Guire hofrat@osadl.org
[ Upstream commit 81646a3d39ef14749301374a3a0b8311384cd412 ]
of_find_compatible_node() returns a device node with refcount incremented and thus needs an explicit of_node_put(). Further relying on an unchecked of_iomap() which can return NULL is problematic here, after all ctrl_base is critical enough for hix5hd2_set_cpu() to call BUG() if not available so a check seems mandated here.
Signed-off-by: Nicholas Mc Guire hofrat@osadl.org 0002 Fixes: commit 06cc5c1d4d73 ("ARM: hisi: enable hix5hd2 SoC") Signed-off-by: Wei Xu xuwei5@hisilicon.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm/mach-hisi/hotplug.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
--- a/arch/arm/mach-hisi/hotplug.c +++ b/arch/arm/mach-hisi/hotplug.c @@ -180,11 +180,15 @@ static bool hix5hd2_hotplug_init(void) struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "hisilicon,cpuctrl"); - if (np) { - ctrl_base = of_iomap(np, 0); - return true; - } - return false; + if (!np) + return false; + + ctrl_base = of_iomap(np, 0); + of_node_put(np); + if (!ctrl_base) + return false; + + return true; }
void hix5hd2_set_cpu(int cpu, bool enable)