user/sven/linux.git/include/linux/tty_driver.h, branch v6.1.148

tty: add the option to have a tty reject a new ldisc

2024-06-27T11:46:17Z

[ Upstream commit 6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59b ] ... and use it to limit the virtual terminals to just N_TTY. They are kind of special, and in particular, the "con_write()" routine violates the "writes cannot sleep" rule that some ldiscs rely on. This avoids the BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659 when N_GSM has been attached to a virtual console, and gsmld_write() calls con_write() while holding a spinlock, and con_write() then tries to get the console lock. Tested-by: Tetsuo Handa Cc: Jiri Slaby Cc: Andrew Morton Cc: Daniel Starke Reported-by: syzbot Closes: https://syzkaller.appspot.com/bug?extid=dbac96d8e73b61aa559c Signed-off-by: Linus Torvalds Link: https://lore.kernel.org/r/20240423163339.59780-1-torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin

tty: remove TTY_DRIVER_MAGIC

2022-09-22T14:12:34Z

According to Greg, in the context of magic numbers as defined in magic-number.rst, "the tty layer should not need this and I'll gladly take patches" Acked-by: Jiri Slaby Signed-off-by: Ahelenia Ziemiańska Ref: https://lore.kernel.org/linux-doc/YyMlovoskUcHLEb7@kroah.com/ Link: https://lore.kernel.org/r/723478a270a3858f27843cbec621df4d5d44efcc.1663288066.git.nabijaczleweli@nabijaczleweli.xyz Signed-off-by: Greg Kroah-Hartman

termios: get rid of non-UAPI asm/termios.h

2022-09-09T08:44:35Z

All non-UAPI asm/termios.h consist of include of UAPI counterpart and, possibly, include of linux/uaccess.h The latter can't be simply removed, even though nothing in linux/termios.h doesn't depend upon it anymore - there are several places that rely upon that indirect chain of includes to pull linux/uaccess.h. So the include needs to be lifted out of there - we lift into tty_driver.h, serdev.h and places that pull asm/termios.h, but none of * linux/uaccess.h (obvious) * net/sock.h (pulls uaccess.h) * linux/{tty,tty_driver,serdev}.h (tty.h pulls tty_driver.h) That leaves us just with the include of UAPI asm/termios.h, which is what will resolve to if we simply remove non-UAPI header. Signed-off-by: Al Viro Link: https://lore.kernel.org/r/YxDnKvYCHn/ogBUv@ZenIV Signed-off-by: Greg Kroah-Hartman

tty: Make ->set_termios() old ktermios const

2022-08-30T12:22:35Z

There should be no reason to adjust old ktermios which is going to get discarded anyway. Reviewed-by: Andy Shevchenko Signed-off-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20220816115739.10928-9-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman

tty: reformat TTY_DRIVER_ flags into kernel-doc

2021-11-26T15:27:42Z

We want to reference TTY_DRIVER_* flags in Documentation/ later in this series. But the current documentation in the TTY_DRIVER_*'s header does not allow that. Reformat it to kernel-doc using "DOC" directive and line-feeds, so that we can include it as it is. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20211126081611.11001-11-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

tty: combine tty_operations triple docs into kernel-doc

2021-11-26T15:27:42Z

In Documentation/driver-api/serial/tty.rst, there are triplicated texts about some struct tty_operations' hooks. Combine them into existing kernel-doc comments of struct tty_operations and drop them from the Documentation/. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20211126081611.11001-8-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

tty: add kernel-doc for tty_operations

2021-11-26T15:27:42Z

tty_operations structure was already documented in a standalone comment in the header beginning. Move it right before the structure and reformat it so it complies to kernel-doc. That way, we can include it in Documentation/ later in this series. Note that we named proc_show's parameters, so that we can reference them in the text. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20211126081611.11001-5-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

tty: add kernel-doc for tty_driver

2021-11-26T15:27:42Z

tty_driver used to have only short comments along its members. Convert them into proper kernel-doc comments in front of the structure. And add some more explanation to them where needed. The whole structure handling is documented at the end too. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20211126081611.11001-4-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman

tty: Fix extra "not" in TTY_DRIVER_REAL_RAW description

2021-10-30T09:02:00Z

TTY_DRIVER_REAL_RAW flag (which is always set for e.g. serial ports) documentation says that driver must always set special character handling flags in certain conditions. However, as the following sentence makes clear, what is actually intended is the opposite. Fix that by removing the unintended double negation. Acked-by: Johan Hovold Signed-off-by: Anssi Hannula Link: https://lore.kernel.org/r/20211027102124.3049414-1-anssi.hannula@bitwise.fi Signed-off-by: Greg Kroah-Hartman

tty: remove extern from functions in tty headers

2021-09-22T14:59:13Z

After the recent headers cleanup, some function declarations still have extern before them. It is superfluous (for function declarations), so remove extern from those which still have it. This unifies them with the rest of the files. Signed-off-by: Jiri Slaby Link: https://lore.kernel.org/r/20210914091134.17426-3-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman