[PATCH AUTOSEL 5.4 20/35] drivers/perf: arm_pmu_acpi: Fix incorrect checking of gicc pointer
From: Sasha Levin <sashal@kernel.org>
Date: 2020-03-16 02:39:11
Also in:
lkml, stable
Subsystem:
arm pmu profiling and debugging, the rest · Maintainers:
Will Deacon, Mark Rutland, Linus Torvalds
From: luanshi <redacted> [ 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 <redacted> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 acce8781c456c..f5c7a845cd7bf 100644
--- a/drivers/perf/arm_pmu_acpi.c
+++ b/drivers/perf/arm_pmu_acpi.c@@ -24,8 +24,6 @@ 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;
@@ -64,11 +62,10 @@ 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); } #if IS_ENABLED(CONFIG_ARM_SPE_PMU)
--
2.20.1
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