linux/drivers/usb/class
Oliver Neukum 66aad7d8d3 usb: cdc-acm: return correct error code on unsupported break
In ACM support for sending breaks to devices is optional.
If a device says that it doenot support sending breaks,
the host must respect that.
Given the number of optional features providing tty operations
for each combination is not practical and errors need to be
returned dynamically if unsupported features are requested.

In case a device does not support break, we want the tty layer
to treat that like it treats drivers that statically cannot
support sending a break. It ignores the inability and does nothing.
This patch uses EOPNOTSUPP to indicate that.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Fixes: 9e98966c7b ("tty: rework break handling")
Link: https://lore.kernel.org/r/20231207132639.18250-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-15 13:52:47 +01:00
..
cdc-acm.c usb: cdc-acm: return correct error code on unsupported break 2023-12-15 13:52:47 +01:00
cdc-acm.h USB: cdc-acm: use CDC serial-state defines 2022-07-25 10:57:41 +02:00
cdc-wdm.c wwan: core: Support slicing in port TX flow of WWAN subsystem 2023-03-17 22:38:31 -07:00
Kconfig
Makefile
usblp.c USB: make devnode() callback in usb_class_driver take a const * 2022-10-20 12:11:56 +02:00
usbtmc.c USB: usbtmc: Fix direction for 0-length ioctl control messages 2023-05-13 17:25:49 +09:00