1 files changed, 48 insertions, 12 deletions

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index ff12f7ac73ef..f9cfd168fbe2 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -181,7 +181,7 @@ struct eventpoll {
 
         /*
          * This is a single linked list that chains all the "struct epitem" that
-         * happened while transfering ready events to userspace w/out
+         * happened while transferring ready events to userspace w/out
          * holding ->lock.
          */
         struct epitem *ovflist;
@@ -316,6 +316,19 @@ static void ep_nested_calls_init(struct nested_calls *ncalls)
 }
 
 /**
+ * ep_events_available - Checks if ready events might be available.
+ *
+ * @ep: Pointer to the eventpoll context.
+ *
+ * Returns: Returns a value different than zero if ready events are available,
+ *          or zero otherwise.
+ */
+static inline int ep_events_available(struct eventpoll *ep)
+{
+        return !list_empty(&ep->rdllist) || ep->ovflist != EP_UNACTIVE_PTR;
+}
+
+/**
  * ep_call_nested - Perform a bound (possibly) nested call, by checking
  *                  that the recursion limit is not exceeded, and that
  *                  the same nested call (by the meaning of same cookie) is
@@ -593,7 +606,7 @@ static void ep_free(struct eventpoll *ep)
          * We do not need to hold "ep->mtx" here because the epoll file
          * is on the way to be removed and no one has references to it
          * anymore. The only hit might come from eventpoll_release_file() but
-         * holding "epmutex" is sufficent here.
+         * holding "epmutex" is sufficient here.
          */
         mutex_lock(&epmutex);
 
@@ -707,7 +720,7 @@ void eventpoll_release_file(struct file *file)
         /*
          * We don't want to get "file->f_lock" because it is not
          * necessary. It is not necessary because we're in the "struct file"
-         * cleanup path, and this means that noone is using this file anymore.
+         * cleanup path, and this means that no one is using this file anymore.
          * So, for example, epoll_ctl() cannot hit here since if we reach this
          * point, the file counter already went to zero and fget() would fail.
          * The only hit might come from ep_free() but by holding the mutex
@@ -1099,7 +1112,7 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
                                  * Trigger mode, we need to insert back inside
                                  * the ready list, so that the next call to
                                  * epoll_wait() will check again the events
-                                 * availability. At this point, noone can insert
+                                 * availability. At this point, no one can insert
                                  * into ep->rdllist besides us. The epoll_ctl()
                                  * callers are locked out by
                                  * ep_scan_ready_list() holding "mtx" and the
@@ -1135,12 +1148,29 @@ static inline struct timespec ep_set_mstimeout(long ms)
         return timespec_add_safe(now, ts);
 }
 
+/**
+ * ep_poll - Retrieves ready events, and delivers them to the caller supplied
+ *           event buffer.
+ *
+ * @ep: Pointer to the eventpoll context.
+ * @events: Pointer to the userspace buffer where the ready events should be
+ *          stored.
+ * @maxevents: Size (in terms of number of events) of the caller event buffer.
+ * @timeout: Maximum timeout for the ready events fetch operation, in
+ *           milliseconds. If the @timeout is zero, the function will not block,
+ *           while if the @timeout is less than zero, the function will block
+ *           until at least one event has been retrieved (or an error
+ *           occurred).
+ *
+ * Returns: Returns the number of ready events which have been fetched, or an
+ *          error code, in case of error.
+ */
 static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
                    int maxevents, long timeout)
 {
-        int res, eavail, timed_out = 0;
+        int res = 0, eavail, timed_out = 0;
         unsigned long flags;
-        long slack;
+        long slack = 0;
         wait_queue_t wait;
         ktime_t expires, *to = NULL;
 
@@ -1151,14 +1181,19 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
                 to = &expires;
                 *to = timespec_to_ktime(end_time);
         } else if (timeout == 0) {
+                /*
+                 * Avoid the unnecessary trip to the wait queue loop, if the
+                 * caller specified a non blocking operation.
+                 */
                 timed_out = 1;
+                spin_lock_irqsave(&ep->lock, flags);
+                goto check_events;
         }
 
-retry:
+fetch_events:
         spin_lock_irqsave(&ep->lock, flags);
 
-        res = 0;
-        if (list_empty(&ep->rdllist)) {
+        if (!ep_events_available(ep)) {
                 /*
                  * We don't have any available event to return to the caller.
                  * We need to sleep here, and we will be wake up by
@@ -1174,7 +1209,7 @@ retry:
                          * to TASK_INTERRUPTIBLE before doing the checks.
                          */
                         set_current_state(TASK_INTERRUPTIBLE);
-                        if (!list_empty(&ep->rdllist) || timed_out)
+                        if (ep_events_available(ep) || timed_out)
                                 break;
                         if (signal_pending(current)) {
                                 res = -EINTR;
@@ -1191,8 +1226,9 @@ retry:
 
                 set_current_state(TASK_RUNNING);
         }
+check_events:
         /* Is it worth to try to dig for events ? */
-        eavail = !list_empty(&ep->rdllist) || ep->ovflist != EP_UNACTIVE_PTR;
+        eavail = ep_events_available(ep);
 
         spin_unlock_irqrestore(&ep->lock, flags);
 
@@ -1203,7 +1239,7 @@ retry:
          */
         if (!res && eavail &&
             !(res = ep_send_events(ep, events, maxevents)) && !timed_out)
-                goto retry;
+                goto fetch_events;
 
         return res;
 }