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-uclogic-params-test.c | 222 ++++++++++++++++++++++++++++++++++ 1 file changed, 222 insertions(+) create mode 100644 drivers/hid/hid-uclogic-params-test.c (limited to 'drivers/hid/hid-uclogic-params-test.c') diff --git a/drivers/hid/hid-uclogic-params-test.c b/drivers/hid/hid-uclogic-params-test.c new file mode 100644 index 000000000..a30121419 --- /dev/null +++ b/drivers/hid/hid-uclogic-params-test.c @@ -0,0 +1,222 @@ +// SPDX-License-Identifier: GPL-2.0+ + +/* + * HID driver for UC-Logic devices not fully compliant with HID standard + * + * Copyright (c) 2022 José Expósito + */ + +#include +#include "./hid-uclogic-params.h" +#include "./hid-uclogic-rdesc.h" + +#define MAX_STR_DESC_SIZE 14 + +struct uclogic_parse_ugee_v2_desc_case { + const char *name; + int res; + const __u8 str_desc[MAX_STR_DESC_SIZE]; + size_t str_desc_size; + const s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM]; + enum uclogic_params_frame_type frame_type; +}; + +static struct uclogic_parse_ugee_v2_desc_case uclogic_parse_ugee_v2_desc_cases[] = { + { + .name = "invalid_str_desc", + .res = -EINVAL, + .str_desc = {}, + .str_desc_size = 0, + .desc_params = {}, + .frame_type = UCLOGIC_PARAMS_FRAME_BUTTONS, + }, + { + .name = "resolution_with_value_0", + .res = 0, + .str_desc = { + 0x0E, 0x03, + 0x70, 0xB2, + 0x10, 0x77, + 0x08, + 0x00, + 0xFF, 0x1F, + 0x00, 0x00, + }, + .str_desc_size = 12, + .desc_params = { + [UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xB270, + [UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0, + [UCLOGIC_RDESC_PEN_PH_ID_Y_LM] = 0x7710, + [UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0, + [UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] = 0x1FFF, + [UCLOGIC_RDESC_FRAME_PH_ID_UM] = 0x08, + }, + .frame_type = UCLOGIC_PARAMS_FRAME_BUTTONS, + }, + /* XP-PEN Deco L str_desc: Frame with 8 buttons */ + { + .name = "frame_type_buttons", + .res = 0, + .str_desc = { + 0x0E, 0x03, + 0x70, 0xB2, + 0x10, 0x77, + 0x08, + 0x00, + 0xFF, 0x1F, + 0xD8, 0x13, + }, + .str_desc_size = 12, + .desc_params = { + [UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xB270, + [UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0x2320, + [UCLOGIC_RDESC_PEN_PH_ID_Y_LM] = 0x7710, + [UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0x1770, + [UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] = 0x1FFF, + [UCLOGIC_RDESC_FRAME_PH_ID_UM] = 0x08, + }, + .frame_type = UCLOGIC_PARAMS_FRAME_BUTTONS, + }, + /* PARBLO A610 PRO str_desc: Frame with 9 buttons and dial */ + { + .name = "frame_type_dial", + .res = 0, + .str_desc = { + 0x0E, 0x03, + 0x96, 0xC7, + 0xF9, 0x7C, + 0x09, + 0x01, + 0xFF, 0x1F, + 0xD8, 0x13, + }, + .str_desc_size = 12, + .desc_params = { + [UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xC796, + [UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0x2749, + [UCLOGIC_RDESC_PEN_PH_ID_Y_LM] = 0x7CF9, + [UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0x1899, + [UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] = 0x1FFF, + [UCLOGIC_RDESC_FRAME_PH_ID_UM] = 0x09, + }, + .frame_type = UCLOGIC_PARAMS_FRAME_DIAL, + }, + /* XP-PEN Deco Pro S str_desc: Frame with 8 buttons and mouse */ + { + .name = "frame_type_mouse", + .res = 0, + .str_desc = { + 0x0E, 0x03, + 0xC8, 0xB3, + 0x34, 0x65, + 0x08, + 0x02, + 0xFF, 0x1F, + 0xD8, 0x13, + }, + .str_desc_size = 12, + .desc_params = { + [UCLOGIC_RDESC_PEN_PH_ID_X_LM] = 0xB3C8, + [UCLOGIC_RDESC_PEN_PH_ID_X_PM] = 0x2363, + [UCLOGIC_RDESC_PEN_PH_ID_Y_LM] = 0x6534, + [UCLOGIC_RDESC_PEN_PH_ID_Y_PM] = 0x13EC, + [UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM] = 0x1FFF, + [UCLOGIC_RDESC_FRAME_PH_ID_UM] = 0x08, + }, + .frame_type = UCLOGIC_PARAMS_FRAME_MOUSE, + }, +}; + +static void uclogic_parse_ugee_v2_desc_case_desc(struct uclogic_parse_ugee_v2_desc_case *t, + char *desc) +{ + strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE); +} + +KUNIT_ARRAY_PARAM(uclogic_parse_ugee_v2_desc, uclogic_parse_ugee_v2_desc_cases, + uclogic_parse_ugee_v2_desc_case_desc); + +static void hid_test_uclogic_parse_ugee_v2_desc(struct kunit *test) +{ + int res; + s32 desc_params[UCLOGIC_RDESC_PH_ID_NUM]; + enum uclogic_params_frame_type frame_type; + const struct uclogic_parse_ugee_v2_desc_case *params = test->param_value; + + res = uclogic_params_parse_ugee_v2_desc(params->str_desc, + params->str_desc_size, + desc_params, + ARRAY_SIZE(desc_params), + &frame_type); + KUNIT_ASSERT_EQ(test, res, params->res); + + if (res) + return; + + KUNIT_EXPECT_EQ(test, + params->desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM], + desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_LM]); + KUNIT_EXPECT_EQ(test, + params->desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM], + desc_params[UCLOGIC_RDESC_PEN_PH_ID_X_PM]); + KUNIT_EXPECT_EQ(test, + params->desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM], + desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_LM]); + KUNIT_EXPECT_EQ(test, + params->desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM], + desc_params[UCLOGIC_RDESC_PEN_PH_ID_Y_PM]); + KUNIT_EXPECT_EQ(test, + params->desc_params[UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM], + desc_params[UCLOGIC_RDESC_PEN_PH_ID_PRESSURE_LM]); + KUNIT_EXPECT_EQ(test, + params->desc_params[UCLOGIC_RDESC_FRAME_PH_ID_UM], + desc_params[UCLOGIC_RDESC_FRAME_PH_ID_UM]); + KUNIT_EXPECT_EQ(test, params->frame_type, frame_type); +} + +struct fake_device { + unsigned long quirks; +}; + +static void hid_test_uclogic_params_cleanup_event_hooks(struct kunit *test) +{ + int res, n; + struct hid_device *hdev; + struct fake_device *fake_dev; + struct uclogic_params p = {0, }; + + hdev = kunit_kzalloc(test, sizeof(struct hid_device), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, hdev); + + fake_dev = kunit_kzalloc(test, sizeof(struct fake_device), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fake_dev); + + hid_set_drvdata(hdev, fake_dev); + + res = uclogic_params_ugee_v2_init_event_hooks(hdev, &p); + KUNIT_ASSERT_EQ(test, res, 0); + + /* Check that the function can be called repeatedly */ + for (n = 0; n < 4; n++) { + uclogic_params_cleanup_event_hooks(&p); + KUNIT_EXPECT_PTR_EQ(test, p.event_hooks, NULL); + } +} + +static struct kunit_case hid_uclogic_params_test_cases[] = { + KUNIT_CASE_PARAM(hid_test_uclogic_parse_ugee_v2_desc, + uclogic_parse_ugee_v2_desc_gen_params), + KUNIT_CASE(hid_test_uclogic_params_cleanup_event_hooks), + {} +}; + +static struct kunit_suite hid_uclogic_params_test_suite = { + .name = "hid_uclogic_params_test", + .test_cases = hid_uclogic_params_test_cases, +}; + +kunit_test_suite(hid_uclogic_params_test_suite); + +MODULE_DESCRIPTION("KUnit tests for the UC-Logic driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("José Expósito "); -- cgit v1.3.1