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epoll: drop EPOLLWAKEUP if PM_SLEEP is disabled 

Drop EPOLLWAKEUP from epoll events mask if CONFIG_PM_SLEEP is disabled.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Amit Pundir 2013-11-15 12:56:31 +05:30 committed by Rafael J. Wysocki
parent dc1ccc4815
commit 95f19f658c
2 changed files with 13 additions and 3 deletions
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3
fs/eventpoll.c
View File

@ -1852,8 +1852,7 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
goto error_tgt_fput;
/* Check if EPOLLWAKEUP is allowed */
if ((epds.events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
epds.events &= ~EPOLLWAKEUP;
ep_take_care_of_epollwakeup(&epds);
/*
* We have to check that the file structure underneath the file descriptor

13
include/uapi/linux/eventpoll.h
View File

@ -61,5 +61,16 @@ struct epoll_event {
__u64 data;
} EPOLL_PACKED;
#ifdef CONFIG_PM_SLEEP
static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
{
if ((epev->events & EPOLLWAKEUP) && !capable(CAP_BLOCK_SUSPEND))
epev->events &= ~EPOLLWAKEUP;
}
#else
static inline void ep_take_care_of_epollwakeup(struct epoll_event *epev)
{
epev->events &= ~EPOLLWAKEUP;
}
#endif
#endif /* _UAPI_LINUX_EVENTPOLL_H */