From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops 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 --- drivers/hid/hid-gfrm.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 150 insertions(+) create mode 100644 drivers/hid/hid-gfrm.c (limited to 'drivers/hid/hid-gfrm.c') diff --git a/drivers/hid/hid-gfrm.c b/drivers/hid/hid-gfrm.c new file mode 100644 index 000000000..f7cc754de --- /dev/null +++ b/drivers/hid/hid-gfrm.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for Google Fiber TV Box remote controls + * + * Copyright (c) 2014-2015 Google Inc. + * + * Author: Petri Gynther + */ +#include +#include +#include +#include + +#include "hid-ids.h" + +#define GFRM100 1 /* Google Fiber GFRM100 (Bluetooth classic) */ +#define GFRM200 2 /* Google Fiber GFRM200 (Bluetooth LE) */ + +#define GFRM100_SEARCH_KEY_REPORT_ID 0xF7 +#define GFRM100_SEARCH_KEY_DOWN 0x0 +#define GFRM100_SEARCH_KEY_AUDIO_DATA 0x1 +#define GFRM100_SEARCH_KEY_UP 0x2 + +static u8 search_key_dn[3] = {0x40, 0x21, 0x02}; +static u8 search_key_up[3] = {0x40, 0x00, 0x00}; + +static int gfrm_input_mapping(struct hid_device *hdev, struct hid_input *hi, + struct hid_field *field, struct hid_usage *usage, + unsigned long **bit, int *max) +{ + const struct hid_device_id *id = hid_get_drvdata(hdev); + unsigned long hdev_type = id->driver_data; + + if (hdev_type == GFRM100) { + if (usage->hid == (HID_UP_CONSUMER | 0x4)) { + /* Consumer.0004 -> KEY_INFO */ + hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_INFO); + return 1; + } + + if (usage->hid == (HID_UP_CONSUMER | 0x41)) { + /* Consumer.0041 -> KEY_OK */ + hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_OK); + return 1; + } + } + + return 0; +} + +static int gfrm_raw_event(struct hid_device *hdev, struct hid_report *report, + u8 *data, int size) +{ + const struct hid_device_id *id = hid_get_drvdata(hdev); + unsigned long hdev_type = id->driver_data; + int ret = 0; + + if (hdev_type != GFRM100) + return 0; + + if (size < 2 || data[0] != GFRM100_SEARCH_KEY_REPORT_ID) + return 0; + + /* + * Convert GFRM100 Search key reports into Consumer.0221 (Key.Search) + * reports. Ignore audio data. + */ + switch (data[1]) { + case GFRM100_SEARCH_KEY_DOWN: + ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_dn, + sizeof(search_key_dn), sizeof(search_key_dn), 1); + break; + + case GFRM100_SEARCH_KEY_AUDIO_DATA: + break; + + case GFRM100_SEARCH_KEY_UP: + ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_up, + sizeof(search_key_up), sizeof(search_key_up), 1); + break; + + default: + break; + } + + return (ret < 0) ? ret : -1; +} + +static int gfrm_input_configured(struct hid_device *hid, struct hid_input *hidinput) +{ + /* + * Enable software autorepeat with: + * - repeat delay: 400 msec + * - repeat period: 100 msec + */ + input_enable_softrepeat(hidinput->input, 400, 100); + return 0; +} + +static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + int ret; + + hid_set_drvdata(hdev, (void *)id); + + ret = hid_parse(hdev); + if (ret) + goto done; + + if (id->driver_data == GFRM100) { + /* + * GFRM100 HID Report Descriptor does not describe the Search + * key reports. Thus, we need to add it manually here, so that + * those reports reach gfrm_raw_event() from hid_input_report(). + */ + if (!hid_register_report(hdev, HID_INPUT_REPORT, + GFRM100_SEARCH_KEY_REPORT_ID, 0)) { + ret = -ENOMEM; + goto done; + } + } + + ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); +done: + return ret; +} + +static const struct hid_device_id gfrm_devices[] = { + { HID_BLUETOOTH_DEVICE(0x58, 0x2000), + .driver_data = GFRM100 }, + { HID_BLUETOOTH_DEVICE(0x471, 0x2210), + .driver_data = GFRM200 }, + { } +}; +MODULE_DEVICE_TABLE(hid, gfrm_devices); + +static struct hid_driver gfrm_driver = { + .name = "gfrm", + .id_table = gfrm_devices, + .probe = gfrm_probe, + .input_mapping = gfrm_input_mapping, + .raw_event = gfrm_raw_event, + .input_configured = gfrm_input_configured, +}; + +module_hid_driver(gfrm_driver); + +MODULE_AUTHOR("Petri Gynther "); +MODULE_DESCRIPTION("Google Fiber TV Box remote control driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1