diff options
| author | Xiao Liang <xiliang@redhat.com> | 2018-01-22 14:12:52 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-31 12:55:56 +0100 |
| commit | dc1932c69835928dcb6259c744043dd03028cdee (patch) | |
| tree | 131cca35266d4a90e64f8d35b2e46619a876b1a0 | |
| parent | eecfa2eeefe3caef4c8d6b2284f6066c76ab26a1 (diff) | |
perf/x86/amd/power: Do not load AMD power module on !AMD platforms
commit 40d4071ce2d20840d224b4a77b5dc6f752c9ab15 upstream.
The AMD power module can be loaded on non AMD platforms, but unload fails
with the following Oops:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: __list_del_entry_valid+0x29/0x90
Call Trace:
perf_pmu_unregister+0x25/0xf0
amd_power_pmu_exit+0x1c/0xd23 [power]
SyS_delete_module+0x1a8/0x2b0
? exit_to_usermode_loop+0x8f/0xb0
entry_SYSCALL_64_fastpath+0x20/0x83
Return -ENODEV instead of 0 from the module init function if the CPU does
not match.
Fixes: c7ab62bfbe0e ("perf/x86/amd/power: Add AMD accumulated power reporting mechanism")
Signed-off-by: Xiao Liang <xiliang@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20180122061252.6394-1-xiliang@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/events/amd/power.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/events/amd/power.c b/arch/x86/events/amd/power.c index 9842270ed2f2..21a4e4127f43 100644 --- a/arch/x86/events/amd/power.c +++ b/arch/x86/events/amd/power.c @@ -277,7 +277,7 @@ static int __init amd_power_pmu_init(void) int ret; if (!x86_match_cpu(cpu_match)) - return 0; + return -ENODEV; if (!boot_cpu_has(X86_FEATURE_ACC_POWER)) return -ENODEV; |