diff --git a/arch/arm/src/cxd56xx/cxd56_usbdev.c b/arch/arm/src/cxd56xx/cxd56_usbdev.c
index 8a966368ca7..a0e70fdf996 100644
--- a/arch/arm/src/cxd56xx/cxd56_usbdev.c
+++ b/arch/arm/src/cxd56xx/cxd56_usbdev.c
@@ -1540,6 +1540,10 @@ static int cxd56_epinterrupt(int irq, FAR void *context)
   uint16_t len;
   int n;
 
+#ifdef CONFIG_SMP
+  irqstate_t flags = enter_critical_section();
+#endif
+
   eps = getreg32(CXD56_USB_DEV_EP_INTR);
     {
       for (n = 0; n < CXD56_NENDPOINTS; n++)
@@ -1813,6 +1817,10 @@ static int cxd56_epinterrupt(int irq, FAR void *context)
         }
     }
 
+#ifdef CONFIG_SMP
+  leave_critical_section(flags);
+#endif
+
   return OK;
 }
 
@@ -2585,6 +2593,10 @@ static int cxd56_epstall(FAR struct usbdev_ep_s *ep, bool resume)
   uint32_t ctrl;
   uint32_t addr;
 
+#ifdef CONFIG_SMP
+  irqstate_t flags = enter_critical_section();
+#endif
+
   addr = USB_ISEPIN(ep->eplog) ? CXD56_USB_IN_EP_CONTROL(privep->epphy)
                                : CXD56_USB_OUT_EP_CONTROL(privep->epphy);
 
@@ -2603,6 +2615,10 @@ static int cxd56_epstall(FAR struct usbdev_ep_s *ep, bool resume)
       privep->stalled = 1;
     }
 
+#ifdef CONFIG_SMP
+  leave_critical_section(flags);
+#endif
+
   return OK;
 }