imx9/imx9_usbdev.c: Fix interrupt handling in SMP mode

The interrupt handler accesses the device as well as the driver's private
data. Use critical_section for mutual exclusion with drivers/usbdev, which
also protects the same data with critical_section.

Signed-off-by: Jukka Laitinen <[email protected]>

Author: jlaitine

arch/arm64/src/imx9/imx9_usbdev.c

@@ -1974,6 +1974,10 @@ static int imx9_usbinterrupt(int irq, void *context, void *arg)
 
   usbtrace(TRACE_INTENTRY(IMX9_TRACEINTID_USB), 0);
 
+#ifdef CONFIG_SMP
+  irqstate_t flags = enter_critical_section();
+#endif
+
   /* Read the interrupts and then clear them */
 
   disr = imx9_getreg(priv, IMX9_USBDEV_USBSTS_OFFSET);
@@ -1985,6 +1989,10 @@ static int imx9_usbinterrupt(int irq, void *context, void *arg)
 
       imx9_usbreset(priv);
 
+#ifdef CONFIG_SMP
+      leave_critical_section(flags);
+#endif
+
       usbtrace(TRACE_INTEXIT(IMX9_TRACEINTID_USB), 0);
       return OK;
     }
@@ -2153,6 +2161,10 @@ static int imx9_usbinterrupt(int irq, void *context, void *arg)
       imx9_putreg(priv, IMX9_USBDEV_ENDPTNAK_OFFSET, pending);
     }
 
+#ifdef CONFIG_SMP
+  leave_critical_section(flags);
+#endif
+
   usbtrace(TRACE_INTEXIT(IMX9_TRACEINTID_USB), 0);
   return OK;
 }