linux/drivers/tty/serial/jsm
Zheyu Ma 240e126c28 tty: serial: jsm: hold port lock when reporting modem line changes
uart_handle_dcd_change() requires a port lock to be held and will emit a
warning when lockdep is enabled.

Held corresponding lock to fix the following warnings.

[  132.528648] WARNING: CPU: 5 PID: 11600 at drivers/tty/serial/serial_core.c:3046 uart_handle_dcd_change+0xf4/0x120
[  132.530482] Modules linked in:
[  132.531050] CPU: 5 PID: 11600 Comm: jsm Not tainted 5.14.0-rc1-00003-g7fef2edf7cc7-dirty #31
[  132.535268] RIP: 0010:uart_handle_dcd_change+0xf4/0x120
[  132.557100] Call Trace:
[  132.557562]  ? __free_pages+0x83/0xb0
[  132.558213]  neo_parse_modem+0x156/0x220
[  132.558897]  neo_param+0x399/0x840
[  132.559495]  jsm_tty_open+0x12f/0x2d0
[  132.560131]  uart_startup.part.18+0x153/0x340
[  132.560888]  ? lock_is_held_type+0xe9/0x140
[  132.561660]  uart_port_activate+0x7f/0xe0
[  132.562351]  ? uart_startup.part.18+0x340/0x340
[  132.563003]  tty_port_open+0x8d/0xf0
[  132.563523]  ? uart_set_options+0x1e0/0x1e0
[  132.564125]  uart_open+0x24/0x40
[  132.564604]  tty_open+0x15c/0x630

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Link: https://lore.kernel.org/r/1626242003-3809-1-git-send-email-zheyuma97@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-21 12:36:48 +02:00
..
jsm_cls.c tty: serial: jsm: jsm_cls: Remove unused variable 'discard' 2020-11-06 10:49:27 +01:00
jsm_driver.c module: remove never implemented MODULE_SUPPORTED_DEVICE 2021-03-17 13:16:18 -07:00
jsm_neo.c tty: serial: jsm: hold port lock when reporting modem line changes 2021-07-21 12:36:48 +02:00
jsm_tty.c tty: serial: jsm: hold port lock when reporting modem line changes 2021-07-21 12:36:48 +02:00
jsm.h tty: serial: Use the correct style for SPDX License Identifier 2020-03-07 09:52:01 +01:00
Makefile tty: add SPDX identifiers to Kconfig and Makefiles 2019-04-04 18:48:43 +02:00