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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>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
This commit is contained in:
Arve Hjønnevåg
2012-05-01 21:33:34 +02:00
committed by Andy Whitcroft
parent e857130bbe
commit 815745edaa
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)