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/input/joystick/spaceball.c | 290 +++++++++++++++++++++++++++++++++++++ 1 file changed, 290 insertions(+) create mode 100644 drivers/input/joystick/spaceball.c (limited to 'drivers/input/joystick/spaceball.c') diff --git a/drivers/input/joystick/spaceball.c b/drivers/input/joystick/spaceball.c new file mode 100644 index 000000000..1af299a41 --- /dev/null +++ b/drivers/input/joystick/spaceball.c @@ -0,0 +1,290 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 1999-2001 Vojtech Pavlik + * + * Based on the work of: + * David Thompson + * Joseph Krahn + */ + +/* + * SpaceTec SpaceBall 2003/3003/4000 FLX driver for Linux + */ + +#include +#include +#include +#include +#include +#include + +#define DRIVER_DESC "SpaceTec SpaceBall 2003/3003/4000 FLX driver" + +MODULE_AUTHOR("Vojtech Pavlik "); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +/* + * Constants. + */ + +#define SPACEBALL_MAX_LENGTH 128 +#define SPACEBALL_MAX_ID 9 + +#define SPACEBALL_1003 1 +#define SPACEBALL_2003B 3 +#define SPACEBALL_2003C 4 +#define SPACEBALL_3003C 7 +#define SPACEBALL_4000FLX 8 +#define SPACEBALL_4000FLX_L 9 + +static int spaceball_axes[] = { ABS_X, ABS_Z, ABS_Y, ABS_RX, ABS_RZ, ABS_RY }; +static char *spaceball_names[] = { + "?", "SpaceTec SpaceBall 1003", "SpaceTec SpaceBall 2003", "SpaceTec SpaceBall 2003B", + "SpaceTec SpaceBall 2003C", "SpaceTec SpaceBall 3003", "SpaceTec SpaceBall SpaceController", + "SpaceTec SpaceBall 3003C", "SpaceTec SpaceBall 4000FLX", "SpaceTec SpaceBall 4000FLX Lefty" }; + +/* + * Per-Ball data. + */ + +struct spaceball { + struct input_dev *dev; + int idx; + int escape; + unsigned char data[SPACEBALL_MAX_LENGTH]; + char phys[32]; +}; + +/* + * spaceball_process_packet() decodes packets the driver receives from the + * SpaceBall. + */ + +static void spaceball_process_packet(struct spaceball* spaceball) +{ + struct input_dev *dev = spaceball->dev; + unsigned char *data = spaceball->data; + int i; + + if (spaceball->idx < 2) return; + + switch (spaceball->data[0]) { + + case 'D': /* Ball data */ + if (spaceball->idx != 15) return; + /* + * Skip first three bytes; read six axes worth of data. + * Axis values are signed 16-bit big-endian. + */ + data += 3; + for (i = 0; i < ARRAY_SIZE(spaceball_axes); i++) { + input_report_abs(dev, spaceball_axes[i], + (__s16)get_unaligned_be16(&data[i * 2])); + } + break; + + case 'K': /* Button data */ + if (spaceball->idx != 3) return; + input_report_key(dev, BTN_1, (data[2] & 0x01) || (data[2] & 0x20)); + input_report_key(dev, BTN_2, data[2] & 0x02); + input_report_key(dev, BTN_3, data[2] & 0x04); + input_report_key(dev, BTN_4, data[2] & 0x08); + input_report_key(dev, BTN_5, data[1] & 0x01); + input_report_key(dev, BTN_6, data[1] & 0x02); + input_report_key(dev, BTN_7, data[1] & 0x04); + input_report_key(dev, BTN_8, data[1] & 0x10); + break; + + case '.': /* Advanced button data */ + if (spaceball->idx != 3) return; + input_report_key(dev, BTN_1, data[2] & 0x01); + input_report_key(dev, BTN_2, data[2] & 0x02); + input_report_key(dev, BTN_3, data[2] & 0x04); + input_report_key(dev, BTN_4, data[2] & 0x08); + input_report_key(dev, BTN_5, data[2] & 0x10); + input_report_key(dev, BTN_6, data[2] & 0x20); + input_report_key(dev, BTN_7, data[2] & 0x80); + input_report_key(dev, BTN_8, data[1] & 0x01); + input_report_key(dev, BTN_9, data[1] & 0x02); + input_report_key(dev, BTN_A, data[1] & 0x04); + input_report_key(dev, BTN_B, data[1] & 0x08); + input_report_key(dev, BTN_C, data[1] & 0x10); + input_report_key(dev, BTN_MODE, data[1] & 0x20); + break; + + case 'E': /* Device error */ + spaceball->data[spaceball->idx - 1] = 0; + printk(KERN_ERR "spaceball: Device error. [%s]\n", spaceball->data + 1); + break; + + case '?': /* Bad command packet */ + spaceball->data[spaceball->idx - 1] = 0; + printk(KERN_ERR "spaceball: Bad command. [%s]\n", spaceball->data + 1); + break; + } + + input_sync(dev); +} + +/* + * Spaceball 4000 FLX packets all start with a one letter packet-type decriptor, + * and end in 0x0d. It uses '^' as an escape for CR, XOFF and XON characters which + * can occur in the axis values. + */ + +static irqreturn_t spaceball_interrupt(struct serio *serio, + unsigned char data, unsigned int flags) +{ + struct spaceball *spaceball = serio_get_drvdata(serio); + + switch (data) { + case 0xd: + spaceball_process_packet(spaceball); + spaceball->idx = 0; + spaceball->escape = 0; + break; + case '^': + if (!spaceball->escape) { + spaceball->escape = 1; + break; + } + spaceball->escape = 0; + fallthrough; + case 'M': + case 'Q': + case 'S': + if (spaceball->escape) { + spaceball->escape = 0; + data &= 0x1f; + } + fallthrough; + default: + if (spaceball->escape) + spaceball->escape = 0; + if (spaceball->idx < SPACEBALL_MAX_LENGTH) + spaceball->data[spaceball->idx++] = data; + break; + } + return IRQ_HANDLED; +} + +/* + * spaceball_disconnect() is the opposite of spaceball_connect() + */ + +static void spaceball_disconnect(struct serio *serio) +{ + struct spaceball* spaceball = serio_get_drvdata(serio); + + serio_close(serio); + serio_set_drvdata(serio, NULL); + input_unregister_device(spaceball->dev); + kfree(spaceball); +} + +/* + * spaceball_connect() is the routine that is called when someone adds a + * new serio device that supports Spaceball protocol and registers it as + * an input device. + */ + +static int spaceball_connect(struct serio *serio, struct serio_driver *drv) +{ + struct spaceball *spaceball; + struct input_dev *input_dev; + int err = -ENOMEM; + int i, id; + + if ((id = serio->id.id) > SPACEBALL_MAX_ID) + return -ENODEV; + + spaceball = kmalloc_obj(*spaceball); + input_dev = input_allocate_device(); + if (!spaceball || !input_dev) + goto fail1; + + spaceball->dev = input_dev; + snprintf(spaceball->phys, sizeof(spaceball->phys), "%s/input0", serio->phys); + + input_dev->name = spaceball_names[id]; + input_dev->phys = spaceball->phys; + input_dev->id.bustype = BUS_RS232; + input_dev->id.vendor = SERIO_SPACEBALL; + input_dev->id.product = id; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &serio->dev; + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + + switch (id) { + case SPACEBALL_4000FLX: + case SPACEBALL_4000FLX_L: + input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_9); + input_dev->keybit[BIT_WORD(BTN_A)] |= BIT_MASK(BTN_A) | + BIT_MASK(BTN_B) | BIT_MASK(BTN_C) | + BIT_MASK(BTN_MODE); + fallthrough; + default: + input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_2) | + BIT_MASK(BTN_3) | BIT_MASK(BTN_4) | + BIT_MASK(BTN_5) | BIT_MASK(BTN_6) | + BIT_MASK(BTN_7) | BIT_MASK(BTN_8); + fallthrough; + case SPACEBALL_3003C: + input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_1) | + BIT_MASK(BTN_8); + } + + for (i = 0; i < 3; i++) { + input_set_abs_params(input_dev, ABS_X + i, -8000, 8000, 8, 40); + input_set_abs_params(input_dev, ABS_RX + i, -1600, 1600, 2, 8); + } + + serio_set_drvdata(serio, spaceball); + + err = serio_open(serio, drv); + if (err) + goto fail2; + + err = input_register_device(spaceball->dev); + if (err) + goto fail3; + + return 0; + + fail3: serio_close(serio); + fail2: serio_set_drvdata(serio, NULL); + fail1: input_free_device(input_dev); + kfree(spaceball); + return err; +} + +/* + * The serio driver structure. + */ + +static const struct serio_device_id spaceball_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_SPACEBALL, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, spaceball_serio_ids); + +static struct serio_driver spaceball_drv = { + .driver = { + .name = "spaceball", + }, + .description = DRIVER_DESC, + .id_table = spaceball_serio_ids, + .interrupt = spaceball_interrupt, + .connect = spaceball_connect, + .disconnect = spaceball_disconnect, +}; + +module_serio_driver(spaceball_drv); -- cgit v1.3.1