1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
index 27937458c231..efa4a519f5e5 100644
--- a/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
+++ b/arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
@@ -23,6 +23,7 @@
 
 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
 
+#include <linux/cpu.h>
 #include <linux/kernfs.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
@@ -310,9 +311,11 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
                 return -EINVAL;
         buf[nbytes - 1] = '\0';
 
+        cpus_read_lock();
         rdtgrp = rdtgroup_kn_lock_live(of->kn);
         if (!rdtgrp) {
                 rdtgroup_kn_unlock(of->kn);
+                cpus_read_unlock();
                 return -ENOENT;
         }
         rdt_last_cmd_clear();
@@ -367,6 +370,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
 
 out:
         rdtgroup_kn_unlock(of->kn);
+        cpus_read_unlock();
         return ret ?: nbytes;
 }