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authorJulien Grall <julien.grall@arm.com>2016-05-31 12:41:22 +0100
committerWill Deacon <will.deacon@arm.com>2016-06-03 10:16:21 +0100
commit0f254c7671e851243412bce6c2e618732831d0f8 (patch)
tree89765603a9ca1a9f88830b09d6244f693398aea8
parent121323ae668e456d0ed328f5b77c22bf5dd8e4de (diff)
downloadlinux-0f254c7671e851243412bce6c2e618732831d0f8.tar.gz
drivers/perf: arm_pmu: Defer the setting of __oprofile_cpu_pmu
The global variable __oprofile_cpu_pmu is set before the PMU is fully initialized. If an error occurs before the end of the initialization, the PMU will be freed and the variable will contain an invalid pointer. This will result in a kernel crash when perf will be used. Fix it by moving the setting of __oprofile_cpu_pmu when the PMU is fully initialized (i.e when it is no longer possible to fail). Cc: <stable@vger.kernel.org> Signed-off-by: Julien Grall <julien.grall@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
-rw-r--r--drivers/perf/arm_pmu.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 6401f0c9fb6e..95614d24675f 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -992,9 +992,6 @@ int arm_pmu_device_probe(struct platform_device *pdev,
armpmu_init(pmu);
- if (!__oprofile_cpu_pmu)
- __oprofile_cpu_pmu = pmu;
-
pmu->plat_device = pdev;
if (node && (of_id = of_match_node(of_table, pdev->dev.of_node))) {
@@ -1030,6 +1027,9 @@ int arm_pmu_device_probe(struct platform_device *pdev,
if (ret)
goto out_destroy;
+ if (!__oprofile_cpu_pmu)
+ __oprofile_cpu_pmu = pmu;
+
pr_info("enabled with %s PMU driver, %d counters available\n",
pmu->name, pmu->num_events);