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annotate poll-related wait keys

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__poll_t is also used as wait key in some waitqueues.
Verify that wait_..._poll() gets __poll_t as key and
provide a helper for wakeup functions to get back to
that __poll_t value.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-07-03 20:14:56 -04:00
parent e6c8adca20
commit 3ad6f93e98
9 changed files with 19 additions and 18 deletions
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9
fs/eventpoll.c
View file

@ -1117,6 +1117,7 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v
unsigned long flags;
struct epitem *epi = ep_item_from_wait(wait);
struct eventpoll *ep = epi->ep;
__poll_t pollflags = key_to_poll(key);
int ewake = 0;
spin_lock_irqsave(&ep->lock, flags);
@ -1138,7 +1139,7 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v
* callback. We need to be able to handle both cases here, hence the
* test for "key" != NULL before the event match test.
*/
if (key && !((unsigned long) key & epi->event.events))
if (pollflags && !(pollflags & epi->event.events))
goto out_unlock;
/*
@ -1175,8 +1176,8 @@ static int ep_poll_callback(wait_queue_entry_t *wait, unsigned mode, int sync, v
*/
if (waitqueue_active(&ep->wq)) {
if ((epi->event.events & EPOLLEXCLUSIVE) &&
!((unsigned long)key & POLLFREE)) {
switch ((unsigned long)key & EPOLLINOUT_BITS) {
!(pollflags & POLLFREE)) {
switch (pollflags & EPOLLINOUT_BITS) {
case POLLIN:
if (epi->event.events & POLLIN)
ewake = 1;
@ -1205,7 +1206,7 @@ out_unlock:
if (!(epi->event.events & EPOLLEXCLUSIVE))
ewake = 1;
if ((unsigned long)key & POLLFREE) {
if (pollflags & POLLFREE) {
/*
* If we race with ep_remove_wait_queue() it can miss
* ->whead = NULL and do another remove_wait_queue() after