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ntsync: Introduce NTSYNC_IOC_EVENT_RESET.

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This corresponds to the NT syscall NtResetEvent().

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

Signed-off-by: Elizabeth Figura <zfigura@codeweavers.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20241213193511.457338-11-zfigura@codeweavers.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Elizabeth Figura 2024-12-13 13:34:51 -06:00 • committed by Greg Kroah-Hartman
parent 2dcba6fc15
commit bbb9797514
2 changed files with 25 additions and 0 deletions
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24
drivers/misc/ntsync.c
View file

@ -559,6 +559,28 @@ static int ntsync_event_set(struct ntsync_obj *event, void __user *argp)
return 0;
}
static int ntsync_event_reset(struct ntsync_obj *event, void __user *argp)
{
struct ntsync_device *dev = event->dev;
__u32 prev_state;
bool all;
if (event->type != NTSYNC_TYPE_EVENT)
return -EINVAL;
all = ntsync_lock_obj(dev, event);
prev_state = event->u.event.signaled;
event->u.event.signaled = false;
ntsync_unlock_obj(dev, event, all);
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;
@ -584,6 +606,8 @@ static long ntsync_obj_ioctl(struct file *file, unsigned int cmd,
return ntsync_mutex_kill(obj, argp);
case NTSYNC_IOC_EVENT_SET:
return ntsync_event_set(obj, argp);
case NTSYNC_IOC_EVENT_RESET:
return ntsync_event_reset(obj, argp);
default:
return -ENOIOCTLCMD;
}

1
include/uapi/linux/ntsync.h
View file

@ -49,5 +49,6 @@ struct ntsync_wait_args {
#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)
#define NTSYNC_IOC_EVENT_RESET _IOR ('N', 0x89, __u32)
#endif