linux-kernel - [PATCH 09/18] clocksource/drivers/exynos_mct: Fix error path in timer resources initialization

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Message-Id: <20190223130707.16704-9-daniel.lezcano@linaro.org>
Date:   Sat, 23 Feb 2019 14:06:57 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/SAMSUNG EXYNOS
        ARM ARCHITECTURES),
        linux-samsung-soc@...r.kernel.org (moderated list:ARM/SAMSUNG EXYNOS
        ARM ARCHITECTURES)
Subject: [PATCH 09/18] clocksource/drivers/exynos_mct: Fix error path in timer resources initialization

From: Marek Szyprowski <m.szyprowski@...sung.com>

While freeing interrupt handlers in error path, don't assume that all
requested interrupts are per-processor interrupts and properly release
standard interrupts too.

Reported-by: Krzysztof Kozlowski <krzk@...nel.org>
Fixes: 56a94f13919c ("clocksource: exynos_mct: Avoid blocking calls in the cpu hotplug notifier")
Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/exynos_mct.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 647ea9fc752f..33e90c080877 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -562,7 +562,19 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
 	return 0;
 
 out_irq:
-	free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
+	if (mct_int_type == MCT_INT_PPI) {
+		free_percpu_irq(mct_irqs[MCT_L0_IRQ], &percpu_mct_tick);
+	} else {
+		for_each_possible_cpu(cpu) {
+			struct mct_clock_event_device *pcpu_mevt =
+				per_cpu_ptr(&percpu_mct_tick, cpu);
+
+			if (pcpu_mevt->evt.irq != -1) {
+				free_irq(pcpu_mevt->evt.irq, pcpu_mevt);
+				pcpu_mevt->evt.irq = -1;
+			}
+		}
+	}
 	return err;
 }
 
-- 
2.17.1