Kuen-Han Tsai c529c3730b usb: gadget: u_serial: Fix race condition in TTY wakeup ... A race condition occurs when gs_start_io() calls either gs_start_rx() or gs_start_tx(), as those functions briefly drop the port_lock for usb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear port.tty and port_usb, respectively. Use the null-safe TTY Port helper function to wake up TTY. Example CPU1: CPU2: gserial_connect() // lock gs_close() // await lock gs_start_rx() // unlock usb_ep_queue() gs_close() // lock, reset port.tty and unlock gs_start_rx() // lock tty_wakeup() // NPE Fixes: 35f95fd7f2 ("TTY: usb/u_serial, use tty from tty_port") Cc: stable <stable@kernel.org> Signed-off-by: Kuen-Han Tsai <khtsai@google.com> Reviewed-by: Prashanth K <prashanth.k@oss.qualcomm.com> Link: https://lore.kernel.org/linux-usb/20240116141801.396398-1-khtsai@google.com/ Link: https://lore.kernel.org/r/20250617050844.1848232-2-khtsai@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-06-19 12:41:13 +02:00
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function	usb: gadget: u_serial: Fix race condition in TTY wakeup	2025-06-19 12:41:13 +02:00
legacy	usb: gadget: g_ffs: Adjust f_ffs[0] allocation type	2025-05-01 17:30:45 +02:00
udc	treewide, timers: Rename from_timer() to timer_container_of()	2025-06-08 09:07:37 +02:00
composite.c	usb: gadget: Use get_status callback to set remote wakeup capability	2025-05-01 17:38:51 +02:00
config.c	usb: Reorganize kerneldoc parameter names	2024-10-04 15:14:23 +02:00
configfs.c	usb: gadget: configfs: Ignore trailing LF for user strings to cdev	2024-12-23 18:50:53 +01:00
configfs.h
epautoconf.c	usb: gadget: epautoconf: Use USB API functions rather than constants	2025-05-21 13:13:22 +02:00
functions.c
Kconfig	usb: gadget: midi2: Reverse-select at the right place	2025-01-07 11:42:22 +01:00
Makefile	usb: gadget: Makefile: remove ccflags-y	2022-03-18 12:56:08 +01:00
u_f.c	usb: gadget: function: move u_f.h to include/linux/usb/func_utils.h	2024-09-03 09:57:08 +02:00
u_os_desc.h	move asm/unaligned.h to linux/unaligned.h	2024-10-02 17:23:23 -04:00
usbstring.c	drivers/usb/gadget: refactor min with min_t	2024-11-13 15:09:50 +01:00