iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86/MCE/AMD: Allow thresholding interface updates after init

Browse Source 
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>
This commit is contained in:
Yazen Ghannam 2022-01-17 16:13:28 +00:00 committed by Greg Kroah-Hartman
parent 74e88eceb0
commit 98ccfec9ea
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/cpu/mce/amd.c
View File

@ -400,7 +400,7 @@ static void threshold_restart_bank(void *_tr)
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);