Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[safe/jmp/linux-2.6] / kernel / irq / manage.c

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 46953a0..540f6c4 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -676,6 +676,18 @@ int request_irq(unsigned int irq, irq_handler_t handler,
        struct irq_desc *desc;
        int retval;
 
+       /*
+        * handle_IRQ_event() always ignores IRQF_DISABLED except for
+        * the _first_ irqaction (sigh).  That can cause oopsing, but
+        * the behavior is classified as "will not fix" so we need to
+        * start nudging drivers away from using that idiom.
+        */
+       if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
+                       == (IRQF_SHARED|IRQF_DISABLED))
+               pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
+                               "guaranteed on shared IRQs\n",
+                               irq, devname);
+
 #ifdef CONFIG_LOCKDEP
        /*
         * Lockdep wants atomic interrupt handlers: