From 7d0928f18bf890d2853281f59aba0dd5a46b34f9 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Thu, 2 Feb 2017 17:32:14 +0000 Subject: [PATCH] arm64: fix erroneous __raw_read_system_reg() cases Since it was introduced in commit da8d02d19ffdd201 ("arm64/capabilities: Make use of system wide safe value"), __raw_read_system_reg() has erroneously mapped some sysreg IDs to other registers. For the fields in ID_ISAR5_EL1, our local feature detection will be erroneous. We may spuriously detect that a feature is uniformly supported, or may fail to detect when it actually is, meaning some compat hwcaps may be erroneous (or not enforced upon hotplug). This patch corrects the erroneous entries. Signed-off-by: Mark Rutland Fixes: da8d02d19ffdd201 ("arm64/capabilities: Make use of system wide safe value") Reported-by: Catalin Marinas Cc: Suzuki K Poulose Cc: Will Deacon Cc: stable@vger.kernel.org Signed-off-by: Will Deacon --- arch/arm64/kernel/cpufeature.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index ed675061dda0..0688b9a3adeb 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -664,15 +664,15 @@ static u64 __raw_read_system_reg(u32 sys_id) case SYS_ID_ISAR2_EL1: return read_cpuid(ID_ISAR2_EL1); case SYS_ID_ISAR3_EL1: return read_cpuid(ID_ISAR3_EL1); case SYS_ID_ISAR4_EL1: return read_cpuid(ID_ISAR4_EL1); - case SYS_ID_ISAR5_EL1: return read_cpuid(ID_ISAR4_EL1); + case SYS_ID_ISAR5_EL1: return read_cpuid(ID_ISAR5_EL1); case SYS_MVFR0_EL1: return read_cpuid(MVFR0_EL1); case SYS_MVFR1_EL1: return read_cpuid(MVFR1_EL1); case SYS_MVFR2_EL1: return read_cpuid(MVFR2_EL1); case SYS_ID_AA64PFR0_EL1: return read_cpuid(ID_AA64PFR0_EL1); - case SYS_ID_AA64PFR1_EL1: return read_cpuid(ID_AA64PFR0_EL1); + case SYS_ID_AA64PFR1_EL1: return read_cpuid(ID_AA64PFR1_EL1); case SYS_ID_AA64DFR0_EL1: return read_cpuid(ID_AA64DFR0_EL1); - case SYS_ID_AA64DFR1_EL1: return read_cpuid(ID_AA64DFR0_EL1); + case SYS_ID_AA64DFR1_EL1: return read_cpuid(ID_AA64DFR1_EL1); case SYS_ID_AA64MMFR0_EL1: return read_cpuid(ID_AA64MMFR0_EL1); case SYS_ID_AA64MMFR1_EL1: return read_cpuid(ID_AA64MMFR1_EL1); case SYS_ID_AA64MMFR2_EL1: return read_cpuid(ID_AA64MMFR2_EL1); -- 2.20.1