From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Mon, 12 Oct 2015 14:48:39 +0100 Subject: [PATCH RESEND] drivers/perf: arm_pmu: avoid CPU device_node reference leak Message-ID: <1444657719-3801-1-git-send-email-will.deacon@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org of_cpu_device_node_get increments the reference count on the CPU device_node, so we must take care to of_node_put once we've finished with it. This patch fixes the perf IRQ probing code to avoid the leak. Cc: Sudeep Holla Cc: Mark Rutland Signed-off-by: Will Deacon --- Arnd/Olof: Please can you take this via arm-soc? It's a non-urgent, yet simple fix and I don't have any other fixes queued for perf. drivers/perf/arm_pmu.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index 2365a32a595e..be3755c973e9 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -823,9 +823,15 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu) } /* Now look up the logical CPU number */ - for_each_possible_cpu(cpu) - if (dn == of_cpu_device_node_get(cpu)) + for_each_possible_cpu(cpu) { + struct device_node *cpu_dn; + + cpu_dn = of_cpu_device_node_get(cpu); + of_node_put(cpu_dn); + + if (dn == cpu_dn) break; + } if (cpu >= nr_cpu_ids) { pr_warn("Failed to find logical CPU for %s\n", -- 2.1.4