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epoll: Add a flag, EPOLLWAKEUP, to prevent suspend while epoll events are ready

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When an epoll_event, that has the EPOLLWAKEUP flag set, is ready, a
wakeup_source will be active to prevent suspend. This can be used to
handle wakeup events from a driver that support poll, e.g. input, if
that driver wakes up the waitqueue passed to epoll before allowing
suspend.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Arve Hjønnevåg 2012-05-01 21:33:34 +02:00 • committed by Rafael J. Wysocki
parent b86ff9820f
commit 4d7e30d989
3 changed files with 103 additions and 4 deletions
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5
include/linux/capability.h
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@ -360,8 +360,11 @@ struct cpu_vfs_cap_data {
#define CAP_WAKE_ALARM 35
/* Allow preventing system suspends while epoll events are pending */
#define CAP_LAST_CAP CAP_WAKE_ALARM
#define CAP_EPOLLWAKEUP 36
#define CAP_LAST_CAP CAP_EPOLLWAKEUP
#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)