From 76b8a0e4c8bda5f03574b8a904331266d162c796 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Fri, 18 Jan 2013 13:42:58 +0000 Subject: [PATCH] ARM: perf: handle armpmu_register failing Currently perf_pmu_register may fail for several reasons (e.g. being unable to allocate memory for the struct device it associates with each PMU), and while any error is propagated by armpmu_register, it is ignored by cpu_pmu_device_probe and not propagated to the caller. This also results in a leak of a struct arm_pmu. This patch adds cleanup if armpmu_register fails, and updates the info messages to better differentiate this type of failure from a failure to probe the PMU type from the hardware or dt. Signed-off-by: Mark Rutland Signed-off-by: Will Deacon --- arch/arm/kernel/perf_event_cpu.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c index 43496f6..1f2740e 100644 --- a/arch/arm/kernel/perf_event_cpu.c +++ b/arch/arm/kernel/perf_event_cpu.c @@ -277,17 +277,22 @@ static int cpu_pmu_device_probe(struct platform_device *pdev) } if (ret) { - pr_info("failed to register PMU devices!"); - kfree(pmu); - return ret; + pr_info("failed to probe PMU!"); + goto out_free; } cpu_pmu = pmu; cpu_pmu->plat_device = pdev; cpu_pmu_init(cpu_pmu); - armpmu_register(cpu_pmu, PERF_TYPE_RAW); + ret = armpmu_register(cpu_pmu, PERF_TYPE_RAW); - return 0; + if (!ret) + return 0; + +out_free: + pr_info("failed to register PMU devices!"); + kfree(pmu); + return ret; } static struct platform_driver cpu_pmu_driver = { -- 2.7.4