--- zzzz-none-000/linux-2.6.39.4/kernel/irq/spurious.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/kernel/irq/spurious.c	2021-11-10 13:38:18.000000000 +0000
@@ -84,7 +84,24 @@
 	 */
 	action = desc->action;
 	if (!action || !(action->flags & IRQF_SHARED) ||
-	    (action->flags & __IRQF_TIMER) || !action->next)
+        /* PATCH http://markmail.org/message/uwkhr7hw6t7o5ls7 
+         * commit fa2727("genirq: Fixup poll handling") introduced
+         * a regression that broke irqfixup/irqpoll for some hardware 
+         * configurations. That patch removed a test that checked for 
+         * 'action->handler' returning IRQ_HANDLED, before acting on 
+         * the IRQ. Putting this test back restores the functionality 
+         * lost since 2.6.39. In the current set of tests after 'action' 
+         * is set, it must precede '!action->next' to take effect.
+         *
+         * With this and the previous patch to spurious.c, c75d720fca8a,
+         * all IRQ regressions that I have encountered are fixed.
+         *
+         * Signed-off-by: Edward Donovan <edwa...@numble.net>
+         */
+	    /*--- (action->flags & __IRQF_TIMER) || !action->next) ---*/
+        (action->flags & __IRQF_TIMER) || 
+        (action->handler(irq, action->dev_id) == IRQ_HANDLED) || 
+        !action->next)
 		goto out;
 
 	/* Already running on another processor */