Subject: [PATCH AUTOSEL 4.14 09/15] drivers/perf: arm_pmu_acpi: Fix incorrect checking of gicc pointer

From: Sasha Levin <[email-masked]>
Date: Sun, 15 Mar 2020 22:35:13 -0400

From: luanshi <[email-masked]>

[ Upstream commit 3ba52ad55b533760a1f65836aa0ec9d35e36bb4f ]

Fix bogus NULL checks on the return value of acpi_cpu_get_madt_gicc()
by checking for a 0 'gicc->performance_interrupt' value instead.

Signed-off-by: Liguang Zhang <[email-masked]>
Signed-off-by: Will Deacon <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 drivers/perf/arm_pmu_acpi.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c
index 3303dd8d8eb57..604e549a9a47d 100644
--- a/drivers/perf/arm_pmu_acpi.c
+++ b/drivers/perf/arm_pmu_acpi.c
@@ -25,8 +25,6 @@ static int arm_pmu_acpi_register_irq(int cpu)
 	int gsi, trigger;
 
 	gicc = acpi_cpu_get_madt_gicc(cpu);
-	if (WARN_ON(!gicc))
-		return -EINVAL;
 
 	gsi = gicc->performance_interrupt;
 
@@ -65,11 +63,10 @@ static void arm_pmu_acpi_unregister_irq(int cpu)
 	int gsi;
 
 	gicc = acpi_cpu_get_madt_gicc(cpu);
-	if (!gicc)
-		return;
 
 	gsi = gicc->performance_interrupt;
-	acpi_unregister_gsi(gsi);
+	if (gsi)
+		acpi_unregister_gsi(gsi);
 }
 
 static int arm_pmu_acpi_parse_irqs(void)
-- 
2.20.1

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