On Wed, May 5, 2021 at 2:19 AM Jiri Slaby [off-list ref] wrote:

Line disciplines expect a positive value or zero returned from
tty->ops->write_room (invoked by tty_write_room). So make this
assumption explicit by using unsigned int as a return value. Both of
tty->ops->write_room and tty_write_room.

Signed-off-by: Jiri Slaby <redacted>
Cc: Richard Henderson <redacted>
Cc: Ivan Kokshaysky <redacted>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Jeff Dike <redacted>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Samuel Iglesias Gonsalvez <redacted>
Cc: Jens Taprogge <jens.taprogge@taprogge.org>
Cc: Karsten Keil <redacted>
Cc: Scott Branden <scott.branden@broadcom.com>
Cc: Ulf Hansson <redacted>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <redacted>
Cc: David Lin <dtwlin@gmail.com>
Cc: Johan Hovold <johan@kernel.org>
Cc: Alex Elder <elder@kernel.org>
Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: David Sterba <dsterba@suse.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Oliver Neukum <oneukum@suse.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Mathias Nyman <mathias.nyman@intel.com>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <redacted>
Cc: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
---
 arch/alpha/kernel/srmcons.c            | 2 +-
 arch/m68k/emu/nfcon.c                  | 2 +-
 arch/parisc/kernel/pdc_cons.c          | 2 +-
 arch/um/drivers/line.c                 | 6 +++---
 arch/um/drivers/line.h                 | 2 +-
 arch/xtensa/platforms/iss/console.c    | 2 +-
 drivers/char/pcmcia/synclink_cs.c      | 2 +-
 drivers/char/ttyprintk.c               | 2 +-
 drivers/ipack/devices/ipoctal.c        | 2 +-
 drivers/isdn/capi/capi.c               | 6 +++---
 drivers/misc/bcm-vk/bcm_vk_tty.c       | 2 +-
 drivers/mmc/core/sdio_uart.c           | 2 +-
 drivers/net/usb/hso.c                  | 4 ++--
 drivers/s390/char/con3215.c            | 2 +-
 drivers/s390/char/sclp_tty.c           | 4 ++--
 drivers/s390/char/sclp_vt220.c         | 4 ++--
 drivers/s390/char/tty3270.c            | 2 +-
 drivers/staging/fwserial/fwserial.c    | 6 +++---
 drivers/staging/gdm724x/gdm_tty.c      | 2 +-
 drivers/staging/greybus/uart.c         | 2 +-
 drivers/tty/amiserial.c                | 2 +-
 drivers/tty/ehv_bytechan.c             | 4 ++--
 drivers/tty/goldfish.c                 | 2 +-
 drivers/tty/hvc/hvc_console.c          | 2 +-
 drivers/tty/hvc/hvcs.c                 | 2 +-
 drivers/tty/hvc/hvsi.c                 | 4 ++--
 drivers/tty/ipwireless/tty.c           | 2 +-
 drivers/tty/mips_ejtag_fdc.c           | 4 ++--
 drivers/tty/moxa.c                     | 8 ++++----
 drivers/tty/mxser.c                    | 2 +-
 drivers/tty/n_gsm.c                    | 2 +-
 drivers/tty/nozomi.c                   | 4 ++--
 drivers/tty/pty.c                      | 2 +-
 drivers/tty/serial/kgdb_nmi.c          | 2 +-
 drivers/tty/serial/serial_core.c       | 4 ++--
 drivers/tty/synclink_gt.c              | 6 +++---
 drivers/tty/tty_ioctl.c                | 2 +-
 drivers/tty/ttynull.c                  | 2 +-
 drivers/tty/vcc.c                      | 4 ++--
 drivers/tty/vt/vt.c                    | 2 +-
 drivers/usb/class/cdc-acm.c            | 2 +-
 drivers/usb/gadget/function/u_serial.c | 6 +++---
 drivers/usb/host/xhci-dbgtty.c         | 4 ++--
 drivers/usb/serial/usb-serial.c        | 2 +-
 include/linux/tty.h                    | 2 +-
 include/linux/tty_driver.h             | 4 ++--
 net/bluetooth/rfcomm/tty.c             | 2 +-
 47 files changed, 71 insertions(+), 71 deletions(-)

Acked-by: Max Filippov <jcmvbkbc@gmail.com> # xtensa

-- 
Thanks.
-- Max