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/usb/serial/generic.c | 656 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 656 insertions(+) create mode 100644 drivers/usb/serial/generic.c (limited to 'drivers/usb/serial/generic.c') diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c new file mode 100644 index 000000000..6eaf74930 --- /dev/null +++ b/drivers/usb/serial/generic.c @@ -0,0 +1,656 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * USB Serial Converter Generic functions + * + * Copyright (C) 2010 - 2013 Johan Hovold (jhovold@gmail.com) + * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_USB_SERIAL_GENERIC + +static __u16 vendor = 0x05f9; +static __u16 product = 0xffff; + +module_param(vendor, ushort, 0); +MODULE_PARM_DESC(vendor, "User specified USB idVendor"); + +module_param(product, ushort, 0); +MODULE_PARM_DESC(product, "User specified USB idProduct"); + +static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ + +static int usb_serial_generic_probe(struct usb_serial *serial, + const struct usb_device_id *id) +{ + struct device *dev = &serial->interface->dev; + + dev_info(dev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n"); + dev_info(dev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n"); + + return 0; +} + +static int usb_serial_generic_calc_num_ports(struct usb_serial *serial, + struct usb_serial_endpoints *epds) +{ + struct device *dev = &serial->interface->dev; + int num_ports; + + num_ports = max(epds->num_bulk_in, epds->num_bulk_out); + + if (num_ports == 0) { + dev_err(dev, "device has no bulk endpoints\n"); + return -ENODEV; + } + + return num_ports; +} + +static struct usb_serial_driver usb_serial_generic_device = { + .driver = { + .name = "generic", + }, + .id_table = generic_device_ids, + .probe = usb_serial_generic_probe, + .calc_num_ports = usb_serial_generic_calc_num_ports, + .throttle = usb_serial_generic_throttle, + .unthrottle = usb_serial_generic_unthrottle, + .resume = usb_serial_generic_resume, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &usb_serial_generic_device, NULL +}; + +#endif + +int usb_serial_generic_register(void) +{ + int retval = 0; + +#ifdef CONFIG_USB_SERIAL_GENERIC + generic_device_ids[0].idVendor = vendor; + generic_device_ids[0].idProduct = product; + generic_device_ids[0].match_flags = + USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; + + retval = usb_serial_register_drivers(serial_drivers, + "usbserial_generic", generic_device_ids); +#endif + return retval; +} + +void usb_serial_generic_deregister(void) +{ +#ifdef CONFIG_USB_SERIAL_GENERIC + usb_serial_deregister_drivers(serial_drivers); +#endif +} + +int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port) +{ + int result = 0; + + clear_bit(USB_SERIAL_THROTTLED, &port->flags); + + if (port->bulk_in_size) + result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); + + return result; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_open); + +void usb_serial_generic_close(struct usb_serial_port *port) +{ + unsigned long flags; + int i; + + if (port->bulk_out_size) { + for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) + usb_kill_urb(port->write_urbs[i]); + + spin_lock_irqsave(&port->lock, flags); + kfifo_reset_out(&port->write_fifo); + spin_unlock_irqrestore(&port->lock, flags); + } + if (port->bulk_in_size) { + for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) + usb_kill_urb(port->read_urbs[i]); + } +} +EXPORT_SYMBOL_GPL(usb_serial_generic_close); + +int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, + void *dest, size_t size) +{ + return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock); +} + +/** + * usb_serial_generic_write_start - start writing buffered data + * @port: usb-serial port + * @mem_flags: flags to use for memory allocations + * + * Serialised using USB_SERIAL_WRITE_BUSY flag. + * + * Return: Zero on success or if busy, otherwise a negative errno value. + */ +int usb_serial_generic_write_start(struct usb_serial_port *port, + gfp_t mem_flags) +{ + struct urb *urb; + int count, result; + unsigned long flags; + int i; + + if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags)) + return 0; +retry: + spin_lock_irqsave(&port->lock, flags); + if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) { + clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); + spin_unlock_irqrestore(&port->lock, flags); + return 0; + } + i = (int)find_first_bit(&port->write_urbs_free, + ARRAY_SIZE(port->write_urbs)); + spin_unlock_irqrestore(&port->lock, flags); + + urb = port->write_urbs[i]; + count = port->serial->type->prepare_write_buffer(port, + urb->transfer_buffer, + port->bulk_out_size); + urb->transfer_buffer_length = count; + usb_serial_debug_data(&port->dev, __func__, count, urb->transfer_buffer); + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes += count; + spin_unlock_irqrestore(&port->lock, flags); + + clear_bit(i, &port->write_urbs_free); + result = usb_submit_urb(urb, mem_flags); + if (result) { + dev_err_console(port, "%s - error submitting urb: %d\n", + __func__, result); + set_bit(i, &port->write_urbs_free); + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes -= count; + spin_unlock_irqrestore(&port->lock, flags); + + clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); + return result; + } + + goto retry; /* try sending off another urb */ +} +EXPORT_SYMBOL_GPL(usb_serial_generic_write_start); + +/** + * usb_serial_generic_write - generic write function + * @tty: tty for the port + * @port: usb-serial port + * @buf: data to write + * @count: number of bytes to write + * + * Return: The number of characters buffered, which may be anything from + * zero to @count, or a negative errno value. + */ +int usb_serial_generic_write(struct tty_struct *tty, + struct usb_serial_port *port, const unsigned char *buf, int count) +{ + int result; + + if (!port->bulk_out_size) + return -ENODEV; + + if (!count) + return 0; + + count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); + result = usb_serial_generic_write_start(port, GFP_ATOMIC); + if (result) + return result; + + return count; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_write); + +unsigned int usb_serial_generic_write_room(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned long flags; + unsigned int room; + + if (!port->bulk_out_size) + return 0; + + spin_lock_irqsave(&port->lock, flags); + room = kfifo_avail(&port->write_fifo); + spin_unlock_irqrestore(&port->lock, flags); + + dev_dbg(&port->dev, "%s - returns %u\n", __func__, room); + return room; +} + +unsigned int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned long flags; + unsigned int chars; + + if (!port->bulk_out_size) + return 0; + + spin_lock_irqsave(&port->lock, flags); + chars = kfifo_len(&port->write_fifo) + port->tx_bytes; + spin_unlock_irqrestore(&port->lock, flags); + + dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars); + return chars; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_chars_in_buffer); + +void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned int bps; + unsigned long period; + unsigned long expire; + + bps = tty_get_baud_rate(tty); + if (!bps) + bps = 9600; /* B0 */ + /* + * Use a poll-period of roughly the time it takes to send one + * character or at least one jiffy. + */ + period = max_t(unsigned long, (10 * HZ / bps), 1); + if (timeout) + period = min_t(unsigned long, period, timeout); + + dev_dbg(&port->dev, "%s - timeout = %u ms, period = %u ms\n", + __func__, jiffies_to_msecs(timeout), + jiffies_to_msecs(period)); + expire = jiffies + timeout; + while (!port->serial->type->tx_empty(port)) { + schedule_timeout_interruptible(period); + if (signal_pending(current)) + break; + if (timeout && time_after(jiffies, expire)) + break; + } +} +EXPORT_SYMBOL_GPL(usb_serial_generic_wait_until_sent); + +static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port, + int index, gfp_t mem_flags) +{ + int res; + + if (!test_and_clear_bit(index, &port->read_urbs_free)) + return 0; + + dev_dbg(&port->dev, "%s - urb %d\n", __func__, index); + + res = usb_submit_urb(port->read_urbs[index], mem_flags); + if (res) { + if (res != -EPERM && res != -ENODEV) { + dev_err(&port->dev, + "%s - usb_submit_urb failed: %d\n", + __func__, res); + } + set_bit(index, &port->read_urbs_free); + return res; + } + + return 0; +} + +int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port, + gfp_t mem_flags) +{ + int res; + int i; + + for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { + res = usb_serial_generic_submit_read_urb(port, i, mem_flags); + if (res) + goto err; + } + + return 0; +err: + for (; i >= 0; --i) + usb_kill_urb(port->read_urbs[i]); + + return res; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs); + +void usb_serial_generic_process_read_urb(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + char *ch = urb->transfer_buffer; + int i; + + if (!urb->actual_length) + return; + /* + * The per character mucking around with sysrq path it too slow for + * stuff like 3G modems, so shortcircuit it in the 99.9999999% of + * cases where the USB serial is not a console anyway. + */ + if (port->sysrq) { + for (i = 0; i < urb->actual_length; i++, ch++) { + if (!usb_serial_handle_sysrq_char(port, *ch)) + tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); + } + } else { + tty_insert_flip_string(&port->port, ch, urb->actual_length); + } + tty_flip_buffer_push(&port->port); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb); + +void usb_serial_generic_read_bulk_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + unsigned char *data = urb->transfer_buffer; + bool stopped = false; + int status = urb->status; + int i; + + for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { + if (urb == port->read_urbs[i]) + break; + } + + dev_dbg(&port->dev, "%s - urb %d, len %d\n", __func__, i, + urb->actual_length); + switch (status) { + case 0: + usb_serial_debug_data(&port->dev, __func__, urb->actual_length, + data); + port->serial->type->process_read_urb(urb); + break; + case -ENOENT: + case -ECONNRESET: + case -ESHUTDOWN: + dev_dbg(&port->dev, "%s - urb stopped: %d\n", + __func__, status); + stopped = true; + break; + case -EPIPE: + dev_err(&port->dev, "%s - urb stopped: %d\n", + __func__, status); + stopped = true; + break; + default: + dev_dbg(&port->dev, "%s - nonzero urb status: %d\n", + __func__, status); + break; + } + + /* + * Make sure URB processing is done before marking as free to avoid + * racing with unthrottle() on another CPU. Matches the barriers + * implied by the test_and_clear_bit() in + * usb_serial_generic_submit_read_urb(). + */ + smp_mb__before_atomic(); + set_bit(i, &port->read_urbs_free); + /* + * Make sure URB is marked as free before checking the throttled flag + * to avoid racing with unthrottle() on another CPU. Matches the + * smp_mb__after_atomic() in unthrottle(). + */ + smp_mb__after_atomic(); + + if (stopped) + return; + + if (test_bit(USB_SERIAL_THROTTLED, &port->flags)) + return; + + usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); + +void usb_serial_generic_write_bulk_callback(struct urb *urb) +{ + unsigned long flags; + struct usb_serial_port *port = urb->context; + int status = urb->status; + int i; + + for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) { + if (port->write_urbs[i] == urb) + break; + } + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes -= urb->transfer_buffer_length; + set_bit(i, &port->write_urbs_free); + spin_unlock_irqrestore(&port->lock, flags); + + switch (status) { + case 0: + break; + case -ENOENT: + case -ECONNRESET: + case -ESHUTDOWN: + dev_dbg(&port->dev, "%s - urb stopped: %d\n", + __func__, status); + return; + case -EPIPE: + dev_err_console(port, "%s - urb stopped: %d\n", + __func__, status); + return; + default: + dev_err_console(port, "%s - nonzero urb status: %d\n", + __func__, status); + break; + } + + usb_serial_generic_write_start(port, GFP_ATOMIC); + usb_serial_port_softint(port); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); + +void usb_serial_generic_throttle(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + + set_bit(USB_SERIAL_THROTTLED, &port->flags); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_throttle); + +void usb_serial_generic_unthrottle(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + + clear_bit(USB_SERIAL_THROTTLED, &port->flags); + + /* + * Matches the smp_mb__after_atomic() in + * usb_serial_generic_read_bulk_callback(). + */ + smp_mb__after_atomic(); + + usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle); + +static bool usb_serial_generic_msr_changed(struct tty_struct *tty, + unsigned long arg, struct async_icount *cprev) +{ + struct usb_serial_port *port = tty->driver_data; + struct async_icount cnow; + unsigned long flags; + bool ret; + + /* + * Use tty-port initialised flag to detect all hangups including the + * one generated at USB-device disconnect. + */ + if (!tty_port_initialized(&port->port)) + return true; + + spin_lock_irqsave(&port->lock, flags); + cnow = port->icount; /* atomic copy*/ + spin_unlock_irqrestore(&port->lock, flags); + + ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) || + ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) || + ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) || + ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts)); + + *cprev = cnow; + + return ret; +} + +int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg) +{ + struct usb_serial_port *port = tty->driver_data; + struct async_icount cnow; + unsigned long flags; + int ret; + + spin_lock_irqsave(&port->lock, flags); + cnow = port->icount; /* atomic copy */ + spin_unlock_irqrestore(&port->lock, flags); + + ret = wait_event_interruptible(port->port.delta_msr_wait, + usb_serial_generic_msr_changed(tty, arg, &cnow)); + if (!ret && !tty_port_initialized(&port->port)) + ret = -EIO; + + return ret; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_tiocmiwait); + +int usb_serial_generic_get_icount(struct tty_struct *tty, + struct serial_icounter_struct *icount) +{ + struct usb_serial_port *port = tty->driver_data; + struct async_icount cnow; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + cnow = port->icount; /* atomic copy */ + spin_unlock_irqrestore(&port->lock, flags); + + icount->cts = cnow.cts; + icount->dsr = cnow.dsr; + icount->rng = cnow.rng; + icount->dcd = cnow.dcd; + icount->tx = cnow.tx; + icount->rx = cnow.rx; + icount->frame = cnow.frame; + icount->parity = cnow.parity; + icount->overrun = cnow.overrun; + icount->brk = cnow.brk; + icount->buf_overrun = cnow.buf_overrun; + + return 0; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_get_icount); + +#if defined(CONFIG_USB_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) +{ + if (port->sysrq) { + if (ch && time_before(jiffies, port->sysrq)) { + handle_sysrq(ch); + port->sysrq = 0; + return 1; + } + port->sysrq = 0; + } + return 0; +} +EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); + +int usb_serial_handle_break(struct usb_serial_port *port) +{ + if (!port->port.console) + return 0; + + if (!port->sysrq) { + port->sysrq = jiffies + HZ*5; + return 1; + } + port->sysrq = 0; + return 0; +} +EXPORT_SYMBOL_GPL(usb_serial_handle_break); +#endif + +/** + * usb_serial_handle_dcd_change - handle a change of carrier detect state + * @port: usb-serial port + * @tty: tty for the port + * @status: new carrier detect status, nonzero if active + */ +void usb_serial_handle_dcd_change(struct usb_serial_port *port, + struct tty_struct *tty, unsigned int status) +{ + dev_dbg(&port->dev, "%s - status %d\n", __func__, status); + + if (tty) { + struct tty_ldisc *ld = tty_ldisc_ref(tty); + + if (ld) { + if (ld->ops->dcd_change) + ld->ops->dcd_change(tty, status); + tty_ldisc_deref(ld); + } + } + + if (status) + wake_up_interruptible(&port->port.open_wait); + else if (tty && !C_CLOCAL(tty)) + tty_hangup(tty); +} +EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change); + +int usb_serial_generic_resume(struct usb_serial *serial) +{ + struct usb_serial_port *port; + int i, c = 0, r; + + for (i = 0; i < serial->num_ports; i++) { + port = serial->port[i]; + if (!tty_port_initialized(&port->port)) + continue; + + if (port->bulk_in_size) { + r = usb_serial_generic_submit_read_urbs(port, + GFP_NOIO); + if (r < 0) + c++; + } + + if (port->bulk_out_size) { + r = usb_serial_generic_write_start(port, GFP_NOIO); + if (r < 0) + c++; + } + } + + return c ? -EIO : 0; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_resume); -- cgit v1.3.1