test/interrupt: account for race with callback

[ upstream commit 73afc9d ]

Because the eal interrupt framework can race when invoking the callback
and a separate unregister call, the test needs to accommodate the chance
that the two collide.  Do this by checking the return value of unregister
against the race-condition flag (EAGAIN).

Fixes: f1a6c22 ("app/test: update interrupts test")

Signed-off-by: Aaron Conole <aconole@redhat.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>

test/test/test_interrupts.c

@@ -370,9 +370,13 @@ test_interrupt_full_path_check(enum test_interrupt_handle_type intr_type)
 		rte_delay_ms(TEST_INTERRUPT_CHECK_INTERVAL);
 
 	rte_delay_ms(TEST_INTERRUPT_CHECK_INTERVAL);
-	if (rte_intr_callback_unregister(&test_intr_handle,
-			test_interrupt_callback, &test_intr_handle) < 0)
-		return -1;
+	while ((count =
+		rte_intr_callback_unregister(&test_intr_handle,
+					     test_interrupt_callback,
+					     &test_intr_handle)) < 0) {
+		if (count != -EAGAIN)
+			return -1;
+	}
 
 	if (flag == 0) {
 		printf("callback has not been called\n");