Changes in kernel/arch/mips32/src/exception.c [8469c53:7be6379] in mainline

File:

• kernel/arch/mips32/src/exception.c (modified) (1 diff)

kernel/arch/mips32/src/exception.c

@@ -165 +165 @@
 static void interrupt_exception(unsigned int n, istate_t *istate)
 {
+        uint32_t ip;
+        uint32_t im;
+
         /* Decode interrupt number and process the interrupt */
-        uint32_t cause = (cp0_cause_read() >> 8) & 0xff;
+        ip = (cp0_cause_read() & cp0_cause_ip_mask) >> cp0_cause_ip_shift;
+        im = (cp0_status_read() & cp0_status_im_mask) >> cp0_status_im_shift;
         
         unsigned int i;
         for (i = 0; i < 8; i++) {
-                if (cause & (1 << i)) {
+
+                /*
+                 * The interrupt could only occur if it is unmasked in the
+                 * status register. On the other hand, an interrupt can be
+                 * apparently pending even if it is masked, so we need to
+                 * check both the masked and pending interrupts.
+                 */
+                if (im & ip & (1 << i)) {
                         irq_t *irq = irq_dispatch_and_lock(i);
                         if (irq) {