From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/drivers/input/evdev.c | 33 +++++++++++++--------------------
1 files changed, 13 insertions(+), 20 deletions(-)
diff --git a/kernel/drivers/input/evdev.c b/kernel/drivers/input/evdev.c
index 05c617b..95f9069 100644
--- a/kernel/drivers/input/evdev.c
+++ b/kernel/drivers/input/evdev.c
@@ -1,11 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Event char devices, giving access to raw input device events.
*
* Copyright (c) 1999-2002 Vojtech Pavlik
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -31,7 +28,6 @@
struct evdev {
int open;
struct input_handle handle;
- wait_queue_head_t wait;
struct evdev_client __rcu *grab;
struct list_head client_list;
spinlock_t client_lock; /* protects client_list */
@@ -46,6 +42,7 @@
unsigned int tail;
unsigned int packet_head; /* [future] position of the first element of next packet */
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
+ wait_queue_head_t wait;
struct fasync_struct *fasync;
struct evdev *evdev;
struct list_head node;
@@ -248,7 +245,6 @@
const struct input_value *vals, unsigned int count,
ktime_t *ev_time)
{
- struct evdev *evdev = client->evdev;
const struct input_value *v;
struct input_event event;
struct timespec64 ts;
@@ -285,7 +281,8 @@
spin_unlock(&client->buffer_lock);
if (wakeup)
- wake_up_interruptible(&evdev->wait);
+ wake_up_interruptible_poll(&client->wait,
+ EPOLLIN | EPOLLOUT | EPOLLRDNORM | EPOLLWRNORM);
}
/*
@@ -428,11 +425,11 @@
struct evdev_client *client;
spin_lock(&evdev->client_lock);
- list_for_each_entry(client, &evdev->client_list, node)
+ list_for_each_entry(client, &evdev->client_list, node) {
kill_fasync(&client->fasync, SIGIO, POLL_HUP);
+ wake_up_interruptible_poll(&client->wait, EPOLLHUP | EPOLLERR);
+ }
spin_unlock(&evdev->client_lock);
-
- wake_up_interruptible(&evdev->wait);
}
static int evdev_release(struct inode *inode, struct file *file)
@@ -474,17 +471,14 @@
{
struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev);
unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev);
- unsigned int size = sizeof(struct evdev_client) +
- bufsize * sizeof(struct input_event);
struct evdev_client *client;
int error;
- client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
- if (!client)
- client = vzalloc(size);
+ client = kvzalloc(struct_size(client, buffer, bufsize), GFP_KERNEL);
if (!client)
return -ENOMEM;
+ init_waitqueue_head(&client->wait);
client->bufsize = bufsize;
spin_lock_init(&client->buffer_lock);
client->evdev = evdev;
@@ -495,7 +489,7 @@
goto err_free_client;
file->private_data = client;
- nonseekable_open(inode, file);
+ stream_open(inode, file);
return 0;
@@ -601,7 +595,7 @@
break;
if (!(file->f_flags & O_NONBLOCK)) {
- error = wait_event_interruptible(evdev->wait,
+ error = wait_event_interruptible(client->wait,
client->packet_head != client->tail ||
!evdev->exist || client->revoked);
if (error)
@@ -619,7 +613,7 @@
struct evdev *evdev = client->evdev;
__poll_t mask;
- poll_wait(file, &evdev->wait, wait);
+ poll_wait(file, &client->wait, wait);
if (evdev->exist && !client->revoked)
mask = EPOLLOUT | EPOLLWRNORM;
@@ -952,7 +946,7 @@
client->revoked = true;
evdev_ungrab(evdev, client);
input_flush_device(&evdev->handle, file);
- wake_up_interruptible(&evdev->wait);
+ wake_up_interruptible_poll(&client->wait, EPOLLHUP | EPOLLERR);
return 0;
}
@@ -1364,7 +1358,6 @@
INIT_LIST_HEAD(&evdev->client_list);
spin_lock_init(&evdev->client_lock);
mutex_init(&evdev->mutex);
- init_waitqueue_head(&evdev->wait);
evdev->exist = true;
dev_no = minor;
--
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