From mboxrd@z Thu Jan 1 00:00:00 1970 From: julien.grall@arm.com (Julien Grall) Date: Tue, 31 May 2016 12:41:21 +0100 Subject: [PATCH 1/3] drivers/perf: arm_pmu: Fix reference count of a device_node in of_pmu_irq_cfg In-Reply-To: <1464694883-26298-1-git-send-email-julien.grall@arm.com> References: <1464694883-26298-1-git-send-email-julien.grall@arm.com> Message-ID: <1464694883-26298-2-git-send-email-julien.grall@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The only function called by of_pmu_irq_cfg that will increment the reference count on dn is of_parse_phandle. Each time we successfully parse a possible CPU from an interrupt-affinity property, we increment the refcount of that CPU node once via of_parse_handle. After validating the CPU is possible, we decrement the refcount once. Subsequently, we decrement the refcount again, either as part of an early break if we don't have a matching SPI, or as part of the end of the loop body. This will lead to decrementing twice the refcounnt. Remove the second pairs of call to of_node_put as nobody is using dn between the first and second call to of_node_put. Signed-off-by: Julien Grall Acked-by: Mark Rutland --- drivers/perf/arm_pmu.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c index f2d01d4..6401f0c 100644 --- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -950,17 +950,14 @@ static int of_pmu_irq_cfg(struct arm_pmu *pmu) /* For SPIs, we need to track the affinity per IRQ */ if (using_spi) { - if (i >= pdev->num_resources) { - of_node_put(dn); + if (i >= pdev->num_resources) break; - } irqs[i] = cpu; } /* Keep track of the CPUs containing this PMU type */ cpumask_set_cpu(cpu, &pmu->supported_cpus); - of_node_put(dn); i++; } while (1); -- 1.9.1