Merge tag 'dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

[pandora-kernel.git] / fs / eventpoll.c

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 4d9d3a4..629e9ed 100644 (file)
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -427,6 +427,31 @@ out_unlock:
        return error;
 }
 
+/*
+ * As described in commit 0ccf831cb lockdep: annotate epoll
+ * the use of wait queues used by epoll is done in a very controlled
+ * manner. Wake ups can nest inside each other, but are never done
+ * with the same locking. For example:
+ *
+ *   dfd = socket(...);
+ *   efd1 = epoll_create();
+ *   efd2 = epoll_create();
+ *   epoll_ctl(efd1, EPOLL_CTL_ADD, dfd, ...);
+ *   epoll_ctl(efd2, EPOLL_CTL_ADD, efd1, ...);
+ *
+ * When a packet arrives to the device underneath "dfd", the net code will
+ * issue a wake_up() on its poll wake list. Epoll (efd1) has installed a
+ * callback wakeup entry on that queue, and the wake_up() performed by the
+ * "dfd" net code will end up in ep_poll_callback(). At this point epoll
+ * (efd1) notices that it may have some event ready, so it needs to wake up
+ * the waiters on its poll wait list (efd2). So it calls ep_poll_safewake()
+ * that ends up in another wake_up(), after having checked about the
+ * recursion constraints. That are, no more than EP_MAX_POLLWAKE_NESTS, to
+ * avoid stack blasting.
+ *
+ * When CONFIG_DEBUG_LOCK_ALLOC is enabled, make sure lockdep can handle
+ * this special case of epoll.
+ */
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 static inline void ep_wake_up_nested(wait_queue_head_t *wqueue,
                                     unsigned long events, int subclass)
@@ -699,9 +724,12 @@ static int ep_read_events_proc(struct eventpoll *ep, struct list_head *head,
                               void *priv)
 {
        struct epitem *epi, *tmp;
+       poll_table pt;
 
+       init_poll_funcptr(&pt, NULL);
        list_for_each_entry_safe(epi, tmp, head, rdllink) {
-               if (epi->ffd.file->f_op->poll(epi->ffd.file, NULL) &
+               pt._key = epi->event.events;
+               if (epi->ffd.file->f_op->poll(epi->ffd.file, &pt) &
                    epi->event.events)
                        return POLLIN | POLLRDNORM;
                else {
@@ -1049,13 +1077,11 @@ static int reverse_path_check_proc(void *priv, void *cookie, int call_nests)
  */
 static int reverse_path_check(void)
 {
-       int length = 0;
        int error = 0;
        struct file *current_file;
 
        /* let's call this for all tfiles */
        list_for_each_entry(current_file, &tfile_check_list, f_tfile_llink) {
-               length++;
                path_count_init();
                error = ep_call_nested(&poll_loop_ncalls, EP_MAX_NESTS,
                                        reverse_path_check_proc, current_file,
@@ -1097,6 +1123,7 @@ static int ep_insert(struct eventpoll *ep, struct epoll_event *event,
        /* Initialize the poll table using the queue callback */
        epq.epi = epi;
        init_poll_funcptr(&epq.pt, ep_ptable_queue_proc);
+       epq.pt._key = event->events;
 
        /*
         * Attach the item to the poll hooks and get current event bits.
@@ -1191,6 +1218,9 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi, struct epoll_even
 {
        int pwake = 0;
        unsigned int revents;
+       poll_table pt;
+
+       init_poll_funcptr(&pt, NULL);
 
        /*
         * Set the new event interest mask before calling f_op->poll();
@@ -1198,13 +1228,14 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi, struct epoll_even
         * f_op->poll() call and the new event set registering.
         */
        epi->event.events = event->events;
+       pt._key = event->events;
        epi->event.data = event->data; /* protected by mtx */
 
        /*
         * Get current event bits. We can safely use the file* here because
         * its usage count has been increased by the caller of this function.
         */
-       revents = epi->ffd.file->f_op->poll(epi->ffd.file, NULL);
+       revents = epi->ffd.file->f_op->poll(epi->ffd.file, &pt);
 
        /*
         * If the item is "hot" and it is not registered inside the ready
@@ -1239,6 +1270,9 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
        unsigned int revents;
        struct epitem *epi;
        struct epoll_event __user *uevent;
+       poll_table pt;
+
+       init_poll_funcptr(&pt, NULL);
 
        /*
         * We can loop without lock because we are passed a task private list.
@@ -1251,7 +1285,8 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
 
                list_del_init(&epi->rdllink);
 
-               revents = epi->ffd.file->f_op->poll(epi->ffd.file, NULL) &
+               pt._key = epi->event.events;
+               revents = epi->ffd.file->f_op->poll(epi->ffd.file, &pt) &
                        epi->event.events;
 
                /*