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ep_send_events_proc(): return result via esed->res

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preparations for not mixing __poll_t and int in ep_scan_ready_list()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-02-01 15:21:13 -05:00
parent e78cd95beb
commit d7ebbe46f4
1 changed files with 10 additions and 7 deletions
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17
fs/eventpoll.c
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@ -260,6 +260,7 @@ struct ep_pqueue {
struct ep_send_events_data {
int maxevents;
struct epoll_event __user *events;
int res;
};
/*
@ -1616,7 +1617,6 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
void *priv)
{
struct ep_send_events_data *esed = priv;
int eventcnt;
unsigned int revents;
struct epitem *epi;
struct epoll_event __user *uevent;
@ -1630,8 +1630,8 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
* Items cannot vanish during the loop because ep_scan_ready_list() is
* holding "mtx" during this call.
*/
for (eventcnt = 0, uevent = esed->events;
!list_empty(head) && eventcnt < esed->maxevents;) {
for (esed->res = 0, uevent = esed->events;
!list_empty(head) && esed->res < esed->maxevents;) {
epi = list_first_entry(head, struct epitem, rdllink);
/*
@ -1665,9 +1665,11 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
__put_user(epi->event.data, &uevent->data)) {
list_add(&epi->rdllink, head);
ep_pm_stay_awake(epi);
return eventcnt ? eventcnt : -EFAULT;
if (!esed->res)
esed->res = -EFAULT;
return 0;
}
eventcnt++;
esed->res++;
uevent++;
if (epi->event.events & EPOLLONESHOT)
epi->event.events &= EP_PRIVATE_BITS;
@ -1689,7 +1691,7 @@ static int ep_send_events_proc(struct eventpoll *ep, struct list_head *head,
}
}
return eventcnt;
return 0;
}
static int ep_send_events(struct eventpoll *ep,
@ -1700,7 +1702,8 @@ static int ep_send_events(struct eventpoll *ep,
esed.maxevents = maxevents;
esed.events = events;
return ep_scan_ready_list(ep, ep_send_events_proc, &esed, 0, false);
ep_scan_ready_list(ep, ep_send_events_proc, &esed, 0, false);
return esed.res;
}
static inline struct timespec64 ep_set_mstimeout(long ms)