From: Yazen Ghannam yazen.ghannam@amd.com
commit 1f52b0aba6fd37653416375cb8a1ca673acf8d5f upstream.
Changes to the AMD Thresholding sysfs code prevents sysfs writes from updating the underlying registers once CPU init is completed, i.e. "threshold_banks" is set.
Allow the registers to be updated if the thresholding interface is already initialized or if in the init path. Use the "set_lvt_off" value to indicate if running in the init path, since this value is only set during init.
Fixes: a037f3ca0ea0 ("x86/mce/amd: Make threshold bank setting hotplug robust") Signed-off-by: Yazen Ghannam yazen.ghannam@amd.com Signed-off-by: Borislav Petkov bp@suse.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20220117161328.19148-1-yazen.ghannam@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kernel/cpu/mce/amd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/mce/amd.c +++ b/arch/x86/kernel/cpu/mce/amd.c @@ -401,7 +401,7 @@ static void threshold_restart_bank(void u32 hi, lo;
/* sysfs write might race against an offline operation */ - if (this_cpu_read(threshold_banks)) + if (!this_cpu_read(threshold_banks) && !tr->set_lvt_off) return;
rdmsr(tr->b->address, lo, hi);