kernel/linux.git/include/linux/tty_driver.h, branch v6.6.132

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

2024-06-27T11:49:05+00:00

[ 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: make tty_operations::write()'s count size_t

2023-08-11T19:12:46+00:00

Unify with the rest of the code. Use size_t for counts and ssize_t for retval. Signed-off-by: "Jiri Slaby (SUSE)" Link: https://lore.kernel.org/r/20230810091510.13006-30-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman

tty: propagate u8 data to tty_operations::put_char()

2023-08-11T19:12:46+00:00

Data are now typed as u8. Propagate this change to tty_operations::put_char(). Signed-off-by: "Jiri Slaby (SUSE)" Cc: Geert Uytterhoeven Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Sven Schnelle Cc: Karsten Keil Cc: Greg Kroah-Hartman Cc: Jiri Slaby Cc: Shawn Guo Cc: Sascha Hauer Cc: Pengutronix Kernel Team Cc: Fabio Estevam Cc: NXP Linux Team Cc: Mathias Nyman Link: https://lore.kernel.org/r/20230810091510.13006-29-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman

tty: propagate u8 data to tty_operations::write()

2023-08-11T19:12:46+00:00

Data are now typed as u8. Propagate this change to tty_operations::write(). Signed-off-by: "Jiri Slaby (SUSE)" Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: Geert Uytterhoeven Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Cc: Chris Zankel Cc: Max Filippov Cc: Arnd Bergmann Cc: Vaibhav Gupta Cc: Jens Taprogge Cc: Karsten Keil Cc: Scott Branden Cc: Ulf Hansson Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Sven Schnelle Cc: David Lin Cc: Johan Hovold Cc: Alex Elder Cc: Laurentiu Tudor Cc: Jiri Kosina Cc: David Sterba Cc: Shawn Guo Cc: Sascha Hauer Cc: Pengutronix Kernel Team Cc: Fabio Estevam Cc: NXP Linux Team Cc: Arnaud Pouliquen Cc: Oliver Neukum Cc: Mathias Nyman Cc: Marcel Holtmann Cc: Johan Hedberg Cc: Luiz Augusto von Dentz Link: https://lore.kernel.org/r/20230810091510.13006-28-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman

tty: remove TTY_DRIVER_MAGIC

2022-09-22T14:12:34+00:00

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

2022-09-09T08:44:35+00:00

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

2022-08-30T12:22:35+00:00

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

2021-11-26T15:27:42+00:00

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

2021-11-26T15:27:42+00:00

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

2021-11-26T15:27:42+00:00

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