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drivers/perf: arm_pmu_acpi: Fix incorrect checking of gicc pointer 

[ 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 <zhangliguang@linux.alibaba.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
luanshi 2020-02-26 13:45:10 +08:00 committed by Greg Kroah-Hartman
parent 1002a094e0
commit 2c4e36033a
1 changed files with 2 additions and 5 deletions
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7
drivers/perf/arm_pmu_acpi.c
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@ -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)