linux-stable.git/drivers/tty, branch v6.16.5

vt: defkeymap: Map keycodes above 127 to K_HOLE

2025-08-28T14:34:13+00:00

commit b43cb4ff85da5cf29c4cd351ef1d7dd8210780f7 upstream.

The maximum number of keycodes got bumped to 256 a very long time ago,
but the default keymaps were never adjusted to match. This is causing
the kernel to interpret keycodes above 127 as U+0000 if the shipped
generated keymap is used.

Fix this by mapping all keycodes above 127 to K_HOLE so the kernel
ignores them.

The contents of this patche were generated by rerunning `loadkeys
--mktable --unicode` and only including the changes to map keycodes
above 127 to K_HOLE.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Myrrh Periwinkle 
Cc: stable 
Reviewed-by: Jiri Slaby 
Link: https://lore.kernel.org/r/20250702-vt-misc-unicode-fixes-v1-2-c27e143cc2eb@qtmlabs.xyz
Signed-off-by: Greg Kroah-Hartman

vt: keyboard: Don't process Unicode characters in K_OFF mode

2025-08-28T14:34:13+00:00

commit b1cc2092ea7a52e2c435aee6d2b1bcb773202663 upstream.

We don't process Unicode characters if the virtual terminal is in raw
mode, so there's no reason why we shouldn't do the same for K_OFF
(especially since people would expect K_OFF to actually turn off all VT
key processing).

Fixes: 9fc3de9c8356 ("vt: Add virtual console keyboard mode OFF")
Signed-off-by: Myrrh Periwinkle 
Cc: stable 
Reviewed-by: Jiri Slaby 
Link: https://lore.kernel.org/r/20250702-vt-misc-unicode-fixes-v1-1-c27e143cc2eb@qtmlabs.xyz
Signed-off-by: Greg Kroah-Hartman

serial: 8250: fix panic due to PSLVERR

2025-08-28T14:34:11+00:00

commit 7f8fdd4dbffc05982b96caf586f77a014b2a9353 upstream.

When the PSLVERR_RESP_EN parameter is set to 1, the device generates
an error response if an attempt is made to read an empty RBR (Receive
Buffer Register) while the FIFO is enabled.

In serial8250_do_startup(), calling serial_port_out(port, UART_LCR,
UART_LCR_WLEN8) triggers dw8250_check_lcr(), which invokes
dw8250_force_idle() and serial8250_clear_and_reinit_fifos(). The latter
function enables the FIFO via serial_out(p, UART_FCR, p->fcr).
Execution proceeds to the serial_port_in(port, UART_RX).
This satisfies the PSLVERR trigger condition.

When another CPU (e.g., using printk()) is accessing the UART (UART
is busy), the current CPU fails the check (value & ~UART_LCR_SPAR) ==
(lcr & ~UART_LCR_SPAR) in dw8250_check_lcr(), causing it to enter
dw8250_force_idle().

Put serial_port_out(port, UART_LCR, UART_LCR_WLEN8) under the port->lock
to fix this issue.

Panic backtrace:
[    0.442336] Oops - unknown exception [#1]
[    0.442343] epc : dw8250_serial_in32+0x1e/0x4a
[    0.442351]  ra : serial8250_do_startup+0x2c8/0x88e
...
[    0.442416] console_on_rootfs+0x26/0x70

Fixes: c49436b657d0 ("serial: 8250_dw: Improve unwritable LCR workaround")
Link: https://lore.kernel.org/all/84cydt5peu.fsf@jogness.linutronix.de/T/
Signed-off-by: Yunhui Cui 
Reviewed-by: John Ogness 
Cc: stable 
Link: https://lore.kernel.org/r/20250723023322.464-2-cuiyunhui@bytedance.com
[ adapted to inline code structure without separate serial8250_initialize helper function ]
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

tty: serial: fix print format specifiers

2025-08-20T16:41:03+00:00

[ Upstream commit 33a2515abd45c64911955ff1da179589db54f99f ]

The serial info sometimes produces negative TX/RX counts. E.g.:

3: uart:FSL_LPUART mmio:0x02970000 irq:46 tx:-1595870545 rx:339619
RTS|CTS|DTR|DSR|CD

It appears that the print format specifiers don't match with the types of
the respective variables. E.g.: All of the fields in struct uart_icount
are u32, but the format specifier used is %d, even though u32 is unsigned
and %d is for signed integers. Update drivers/tty/serial/serial_core.c
to use the proper format specifiers. Reference
https://docs.kernel.org/core-api/printk-formats.html as the documentation
for what format specifiers are the proper ones to use for a given C type.

Signed-off-by: Joseph Tilahun 
Link: https://lore.kernel.org/r/20250610065653.3750067-1-jtilahun@astranis.com
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Sasha Levin

pch_uart: Fix dma_sync_sg_for_device() nents value

2025-07-09T11:43:02+00:00

The dma_sync_sg_for_device() functions should be called with the same
nents as the dma_map_sg(), not the value the map function returned
according to the documentation in Documentation/core-api/dma-api.rst:450:
	With the sync_sg API, all the parameters must be the same
	as those passed into the sg mapping API.

Fixes: da3564ee027e ("pch_uart: add multi-scatter processing")
Cc: stable 
Signed-off-by: Thomas Fourier 
Reviewed-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20250701113452.18590-2-fourier.thomas@gmail.com
Signed-off-by: Greg Kroah-Hartman

serial: core: fix OF node leak

2025-07-09T11:41:48+00:00

Make sure to drop the OF node reference taken when initialising the
control and port devices when the devices are later released.

Fixes: d36f0e9a0002 ("serial: core: restore of_node information in sysfs")
Cc: Aidan Stewart 
Signed-off-by: Johan Hovold 
Link: https://lore.kernel.org/r/20250708085817.16070-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman

serial: imx: Restore original RXTL for console to fix data loss

2025-06-24T14:34:21+00:00

Commit 7a637784d517 ("serial: imx: reduce RX interrupt frequency")
introduced a regression on the i.MX6UL EVK board. The issue can be
reproduced with the following steps:

- Open vi on the board.
- Paste a text file (~150 characters).
- Save the file, then repeat the process.
- Compare the sha256sum of the saved files.

The checksums do not match due to missing characters or entire lines.

Fix this by restoring the RXTL value to 1 when the UART is used as a
console.

This ensures timely RX interrupts and reliable data reception in console
mode.

With this change, pasted content is saved correctly, and checksums are
always consistent.

Cc: stable 
Fixes: 7a637784d517 ("serial: imx: reduce RX interrupt frequency")
Signed-off-by: Fabio Estevam 
Reviewed-by: Stefan Wahren 
Link: https://lore.kernel.org/r/20250619114617.2791939-1-festevam@gmail.com
Signed-off-by: Greg Kroah-Hartman

serial: core: restore of_node information in sysfs

2025-06-19T11:27:48+00:00

Since in v6.8-rc1, the of_node symlink under tty devices is
missing. This breaks any udev rules relying on this information.

Link the of_node information in the serial controller device with the
parent defined in the device tree. This will also apply to the serial
device which takes the serial controller as a parent device.

Fixes: b286f4e87e32 ("serial: core: Move tty and serdev to be children of serial core port device")
Cc: stable@vger.kernel.org
Signed-off-by: Aidan Stewart 
Link: https://lore.kernel.org/r/20250617164819.13912-1-astewart@tektelic.com
Signed-off-by: Greg Kroah-Hartman

vt: fix kernel-doc warnings in ucs_get_fallback()

2025-06-19T11:27:36+00:00

Use the correct function parameter name in ucs_get_fallback() to prevent
kernel-doc warnings:

Warning: drivers/tty/vt/ucs.c:218 function parameter 'cp' not described in 'ucs_get_fallback'
Warning: drivers/tty/vt/ucs.c:218 Excess function parameter 'base' description in 'ucs_get_fallback'

Fixes: fe26933cf1e1 ("vt: add ucs_get_fallback()")
Signed-off-by: Randy Dunlap 
Cc: Nicolas Pitre 
Cc: Greg Kroah-Hartman 
Cc: Jiri Slaby 
Cc: linux-serial@vger.kernel.org
Reviewed-by: Nicolas Pitre .
Link: https://lore.kernel.org/r/20250611020229.2650595-1-rdunlap@infradead.org
Signed-off-by: Greg Kroah-Hartman

vt: add missing notification when switching back to text mode

2025-06-19T11:27:16+00:00

Programs using poll() on /dev/vcsa to be notified when VT changes occur
were missing one case: the switch from gfx to text mode.

Signed-off-by: Nicolas Pitre 
Link: https://lore.kernel.org/r/9o5ro928-0pp4-05rq-70p4-ro385n21n723@onlyvoer.pbz
Signed-off-by: Greg Kroah-Hartman