ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/hid/hid-topseed.c b/drivers/hid/hid-topseed.c
new file mode 100644
index 000000000..645e36cd8
--- /dev/null
+++ b/drivers/hid/hid-topseed.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  HID driver for TopSeed Cyberlink remote
+ *
+ *  Copyright (c) 2008 Lev Babiev
+ *  based on hid-cherry driver
+ *
+ *  Modified to also support BTC "Emprex 3009URF III Vista MCE Remote" by
+ *  Wayne Thomas 2010.
+ *
+ *  Modified to support Conceptronic CLLRCMCE by
+ *  Kees Bakker 2010.
+ */
+
+/*
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#define ts_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \
+					EV_KEY, (c))
+static int ts_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+		struct hid_field *field, struct hid_usage *usage,
+		unsigned long **bit, int *max)
+{
+	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_LOGIVENDOR)
+		return 0;
+
+	switch (usage->hid & HID_USAGE) {
+	case 0x00c: ts_map_key_clear(KEY_WLAN);		break;
+	case 0x00d: ts_map_key_clear(KEY_MEDIA);	break;
+	case 0x010: ts_map_key_clear(KEY_ZOOM);		break;
+	case 0x024: ts_map_key_clear(KEY_MENU);		break;
+	case 0x025: ts_map_key_clear(KEY_TV);		break;
+	case 0x027: ts_map_key_clear(KEY_MODE);		break;
+	case 0x031: ts_map_key_clear(KEY_AUDIO);	break;
+	case 0x032: ts_map_key_clear(KEY_TEXT);		break;
+	case 0x033: ts_map_key_clear(KEY_CHANNEL);	break;
+	case 0x047: ts_map_key_clear(KEY_MP3);		break;
+	case 0x048: ts_map_key_clear(KEY_TV2);		break;
+	case 0x049: ts_map_key_clear(KEY_CAMERA);	break;
+	case 0x04a: ts_map_key_clear(KEY_VIDEO);	break;
+	case 0x04b: ts_map_key_clear(KEY_ANGLE);	break;
+	case 0x04c: ts_map_key_clear(KEY_LANGUAGE);	break;
+	case 0x04d: ts_map_key_clear(KEY_SUBTITLE);	break;
+	case 0x050: ts_map_key_clear(KEY_RADIO);	break;
+	case 0x05a: ts_map_key_clear(KEY_TEXT);		break;
+	case 0x05b: ts_map_key_clear(KEY_RED);		break;
+	case 0x05c: ts_map_key_clear(KEY_GREEN);	break;
+	case 0x05d: ts_map_key_clear(KEY_YELLOW);	break;
+	case 0x05e: ts_map_key_clear(KEY_BLUE);		break;
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static const struct hid_device_id ts_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPSEED, USB_DEVICE_ID_TOPSEED_CYBERLINK) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_BTC, USB_DEVICE_ID_BTC_EMPREX_REMOTE) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_BTC, USB_DEVICE_ID_BTC_EMPREX_REMOTE_2) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_TOPSEED2, USB_DEVICE_ID_TOPSEED2_RF_COMBO) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS) },
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TOSHIBA_WT10A) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, ts_devices);
+
+static struct hid_driver ts_driver = {
+	.name = "topseed",
+	.id_table = ts_devices,
+	.input_mapping = ts_input_mapping,
+};
+module_hid_driver(ts_driver);
+
+MODULE_DESCRIPTION("HID driver for TopSeed Cyberlink remote");
+MODULE_LICENSE("GPL");