Add a swi_remove() function to teardown software interrupt handlers. For

now it just calls intr_event_remove_handler(), but at some point it might
also be responsible for tearing down interrupt events created via swi_add.

1 files changed, 17 insertions, 0 deletions

diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c
index fe9b597..db69b83 100644
--- a/sys/kern/kern_intr.c
+++ b/sys/kern/kern_intr.c
@@ -541,6 +541,10 @@ intr_event_schedule_thread(struct intr_event *ie)
 	return (0);
 }
 
+/*
+ * Add a software interrupt handler to a specified event.  If a given event
+ * is not specified, then a new event is created.
+ */
 int
 swi_add(struct intr_event **eventp, const char *name, driver_intr_t handler,
 	    void *arg, int pri, enum intr_type flags, void **cookiep)
@@ -596,6 +600,19 @@ swi_sched(void *cookie, int flags)
 	}
 }
 
+/*
+ * Remove a software interrupt handler.  Currently this code does not
+ * remove the associated interrupt event if it becomes empty.  Calling code
+ * may do so manually via intr_event_destroy(), but that's not really
+ * an optimal interface.
+ */
+int
+swi_remove(void *cookie)
+{
+
+	return (intr_event_remove_handler(cookie));
+}
+
 static void
 ithread_execute_handlers(struct proc *p, struct intr_event *ie)
 {