drivers/perf: arm_pmu: Fix failure path in PM notifier

BugLink: https://bugs.launchpad.net/bugs/1839376
commit 0d7fd70f26039bd4b33444ca47f0e69ce3ae0354 upstream.

Handling of the CPU_PM_ENTER_FAILED transition in the Arm PMU PM
notifier code incorrectly skips restoration of the counters. Fix the
logic so that CPU_PM_ENTER_FAILED follows the same path as CPU_PM_EXIT.

Cc: <stable@vger.kernel.org>
Fixes: da4e4f18afe0f372 ("drivers/perf: arm_pmu: implement CPU_PM notifier")
Reported-by: Anders Roxell <anders.roxell@linaro.org>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 324ddf317a067fd6ecdc0ccc309b141f3c62657f..2d1d99f150597e7f60933e9958b46cc360767f51 100644 (file)
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -751,8 +751,8 @@ static int cpu_pm_pmu_notify(struct notifier_block *b, unsigned long cmd,
                cpu_pm_pmu_setup(armpmu, cmd);
                break;
        case CPU_PM_EXIT:
-               cpu_pm_pmu_setup(armpmu, cmd);
        case CPU_PM_ENTER_FAILED:
+               cpu_pm_pmu_setup(armpmu, cmd);
                armpmu->start(armpmu);
                break;
        default: