[PATCH 10/31] ntsync: Introduce NTSYNC_IOC_EVENT_SET.

[Elizabeth Figura]

This corresponds to the NT syscall NtSetEvent().

This sets the event to the signaled state, and returns its previous state.

Signed-off-by: Elizabeth Figura <zfig...@codeweavers.com>
---
 drivers/misc/ntsync.c       | 37 +++++++++++++++++++++++++++++++++++++
 include/uapi/linux/ntsync.h |  1 +
 2 files changed, 38 insertions(+)

diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index 2a21e7b0982a..bc24de02fd1c 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c
@@ -456,6 +456,41 @@ static int ntsync_mutex_kill(struct ntsync_obj *mutex, 
void __user *argp)
        return ret;
 }
 
+static int ntsync_event_set(struct ntsync_obj *event, void __user *argp)
+{
+       struct ntsync_device *dev = event->dev;
+       __u32 prev_state;
+
+       if (event->type != NTSYNC_TYPE_EVENT)
+               return -EINVAL;
+
+       if (atomic_read(&event->all_hint) > 0) {
+               spin_lock(&dev->wait_all_lock);
+               spin_lock_nest_lock(&event->lock, &dev->wait_all_lock);
+
+               prev_state = event->u.event.signaled;
+               event->u.event.signaled = true;
+               try_wake_all_obj(dev, event);
+               try_wake_any_event(event);
+
+               spin_unlock(&event->lock);
+               spin_unlock(&dev->wait_all_lock);
+       } else {
+               spin_lock(&event->lock);
+
+               prev_state = event->u.event.signaled;
+               event->u.event.signaled = true;
+               try_wake_any_event(event);
+
+               spin_unlock(&event->lock);
+       }
+
+       if (put_user(prev_state, (__u32 __user *)argp))
+               return -EFAULT;
+
+       return 0;
+}
+
 static int ntsync_obj_release(struct inode *inode, struct file *file)
 {
        struct ntsync_obj *obj = file->private_data;
@@ -479,6 +514,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned 
int cmd,
                return ntsync_mutex_unlock(obj, argp);
        case NTSYNC_IOC_MUTEX_KILL:
                return ntsync_mutex_kill(obj, argp);
+       case NTSYNC_IOC_EVENT_SET:
+               return ntsync_event_set(obj, argp);
        default:
                return -ENOIOCTLCMD;
        }
diff --git a/include/uapi/linux/ntsync.h b/include/uapi/linux/ntsync.h
index b8cf503365ef..782057552483 100644
--- a/include/uapi/linux/ntsync.h
+++ b/include/uapi/linux/ntsync.h
@@ -48,5 +48,6 @@ struct ntsync_wait_args {
 #define NTSYNC_IOC_SEM_POST            _IOWR('N', 0x81, __u32)
 #define NTSYNC_IOC_MUTEX_UNLOCK                _IOWR('N', 0x85, struct 
ntsync_mutex_args)
 #define NTSYNC_IOC_MUTEX_KILL          _IOW ('N', 0x86, __u32)
+#define NTSYNC_IOC_EVENT_SET           _IOR ('N', 0x88, __u32)
 
 #endif
-- 
2.43.0