linux.git/include/linux/mISDNhw.h, branch master

net: remove ISDN subsystem and Bluetooth CMTP

2026-04-23T17:24:02+00:00

Remove the ISDN (mISDN, CAPI) subsystem and Bluetooth CMTP protocol from the kernel tree. ISDN is a pretty old technology and it's unclear whether anyone still uses it. I went over the last few years of git history and all the commits are either tree-wide conversions or syzbot/static analyzer fixes. When we discussed removal in the past IIRC there were some concerns about ISDN still being used in parts of Germany. Unfortunately, the code base is quite old, none of the current maintainers are familiar with it and AI tools will have a field day finding bugs here. Delete this code and preserve it in an out-of-tree repository for any remaining users: https://github.com/linux-netdev/mod-orphan UAPI constants AF_ISDN/PF_ISDN and the SELinux isdn_socket class are preserved for ABI stability, but the rest of uAPI is removed. Signed-off-by: Jakub Kicinski Acked-by: Greg Kroah-Hartman Acked-by: Stephen Hemminger Acked-by: Luiz Augusto von Dentz Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260421022108.1299678-1-kuba@kernel.org Signed-off-by: Paolo Abeni

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174

2019-05-30T18:26:41+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Kate Stewart Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman

mISDN: Fix wrong usage of flush_work_sync while holding locks

2012-09-13T18:58:54+00:00

It is a bad idea to hold a spinlock and call flush_work_sync. Move the workqueue cleanup outside the spinlock and use cancel_work_sync, on closing the channel this seems to be the more correct function. Remove the never used and constant return value of mISDN_freebchannel. Signed-off-by: Karsten Keil Cc: Signed-off-by: David S. Miller

mISDN: Implement MISDN_CTRL_RX_OFF for more drivers

2012-05-16T19:24:36+00:00

MISDN_CTRL_RX_OFF is a meachanism to discard RX data in the driver if the data is not needed by the application. It can be used when playing mesages, but not recording or with unidirectional protocols. Signed-off-by: Karsten Keil Signed-off-by: David S. Miller

mISDN: Implement MISDN_CTRL_FILL_EMPTY for more drivers

2012-05-16T19:24:05+00:00

MISDN_CTRL_FILL_EMPTY is a meachanism to send a fixed value (normally silence) as long no data from upper layers is available. It can be used when recording voice messages or with unidirectional protocols. Signed-off-by: Karsten Keil Signed-off-by: David S. Miller

mISDN: Allow to set a minimum length for transparent data

2012-05-16T19:23:46+00:00

If the FIFO of the card is small, many short messages are queued up to the upper layers and the userspace. This change allows the applications to set a minimum datalen they want from the drivers. Create a common control function to avoid code duplication in each driver. Signed-off-by: Karsten Keil Signed-off-by: David S. Miller

mISDN: Reduce RX buffer allocation for transparent data

2012-05-16T19:23:28+00:00

We did allways allocate maxsize buffers, but for transparent data we know the actual size. Use a common function to calculate size and detect overflows. Signed-off-by: Karsten Keil Signed-off-by: David S. Miller

mISDN: Early confirm for transparent data

2012-05-16T19:22:29+00:00

It is better to send a confirm for transparent data early as possible to avoid TX underuns. Signed-off-by: Karsten Keil Signed-off-by: David S. Miller

mISDN: Make layer1 timer 3 value configurable

2012-05-04T15:55:05+00:00

For certification test it is very useful to change the layer1 timer3 value on runtime. Signed-off-by: Karsten Keil Signed-off-by: David S. Miller

mISDN: Make clearing B-channel a common function

2009-07-25T18:18:16+00:00

Clearing B-channel is needed in every driver, so it makes sense to have it as common function. Signed-off-by: Karsten Keil