From fa66ea10334dff6e1e9c732a0b2890ec257533af Mon Sep 17 00:00:00 2001
From: erpalma <palmarini@unive.it>
Date: Fri, 19 Mar 2021 19:22:06 +0100
Subject: [PATCH] handle EIO errno when reading/writing MSRs (fix #242)

---
 lenovo_fix.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lenovo_fix.py b/lenovo_fix.py
index dac6cbd..bbfda9c 100755
--- a/lenovo_fix.py
+++ b/lenovo_fix.py
@@ -12,7 +12,7 @@ import subprocess
 import sys
 from collections import defaultdict
 from datetime import datetime
-from errno import EACCES, EPERM
+from errno import EACCES, EIO, EPERM
 from multiprocessing import cpu_count
 from platform import uname
 from threading import Event, Thread
@@ -226,6 +226,8 @@ def writemsr(msr, val):
                 'Unable to write to MSR. Try to disable Secure Boot '
                 'and check if your kernel does not restrict access to MSR.'
             )
+        elif e.errno == EIO:
+            fatal('Unable to write to MSR. Unknown error.')
         else:
             raise e
 
@@ -257,6 +259,8 @@ def readmsr(msr, from_bit=0, to_bit=63, cpu=None, flatten=False):
     except (IOError, OSError) as e:
         if e.errno == EPERM or e.errno == EACCES:
             fatal('Unable to read from MSR. Try to disable Secure Boot.')
+        elif e.errno == EIO:
+            fatal('Unable to read to MSR. Unknown error.')
         else:
             raise e