1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 5bb61de23201..9d37e967fa19 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -100,7 +100,16 @@ ENTRY(cpu_do_resume)
 
         msr     tcr_el1, x8
         msr     vbar_el1, x9
+
+        /*
+         * __cpu_setup() cleared MDSCR_EL1.MDE and friends, before unmasking
+         * debug exceptions. By restoring MDSCR_EL1 here, we may take a debug
+         * exception. Mask them until local_dbg_restore() in cpu_suspend()
+         * resets them.
+         */
+        disable_dbg
         msr     mdscr_el1, x10
+
         msr     sctlr_el1, x12
         /*
          * Restore oslsr_el1 by writing oslar_el1