linux-kernel - [PATCH v2 0/3] USB: serial: return errors from break handling

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Date:   Sun,  4 Jun 2023 14:35:02 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Corey Minyard <minyard@....org>
Subject: [PATCH v2 0/3] USB: serial: return errors from break handling

This series starts returning errors from break handling and also uses
that mechanism to report to user space when break signalling is not
supported (e.g. when device or driver support is missing).

Note that the tty layer currently returns early but without reporting
errors when a tty driver does not support break signalling. The intent
expressed in commit 9e98966c7bb9 ("tty: rework break handling") from
2008 appears to be to allow missing support to be reported to user
space however.

Johan


Changes in v2
 - fix return of potentially uninitialised status variable in
   io_edgeport as reported by kernel test robot <lkp@...el.com> and Dan
   Carpenter:

   https://lore.kernel.org/all/202306031014.qzAY3uQ6-lkp@intel.com/


Johan Hovold (3):
  USB: serial: return errors from break handling
  USB: serial: cp210x: disable break signalling on CP2105 SCI
  USB: serial: report unsupported break signalling

 drivers/usb/serial/ark3116.c          |  7 +++--
 drivers/usb/serial/belkin_sa.c        | 12 ++++++---
 drivers/usb/serial/ch341.c            | 37 +++++++++++++++++----------
 drivers/usb/serial/cp210x.c           | 14 +++++++---
 drivers/usb/serial/digi_acceleport.c  |  7 ++---
 drivers/usb/serial/f81232.c           |  4 ++-
 drivers/usb/serial/f81534.c           |  4 ++-
 drivers/usb/serial/ftdi_sio.c         | 10 +++++---
 drivers/usb/serial/io_edgeport.c      |  6 +++--
 drivers/usb/serial/io_ti.c            |  9 +++++--
 drivers/usb/serial/keyspan.c          |  5 +++-
 drivers/usb/serial/keyspan_pda.c      |  8 ++++--
 drivers/usb/serial/mct_u232.c         |  6 ++---
 drivers/usb/serial/mos7720.c          |  9 ++++---
 drivers/usb/serial/mos7840.c          |  7 ++---
 drivers/usb/serial/mxuport.c          |  6 ++---
 drivers/usb/serial/pl2303.c           | 14 ++++++----
 drivers/usb/serial/quatech2.c         |  8 ++++--
 drivers/usb/serial/ti_usb_3410_5052.c | 10 +++++---
 drivers/usb/serial/upd78f0730.c       |  7 +++--
 drivers/usb/serial/usb-serial.c       |  4 +--
 drivers/usb/serial/usb_debug.c        | 13 +++++++---
 drivers/usb/serial/whiteheat.c        |  7 ++---
 drivers/usb/serial/xr_serial.c        |  4 +--
 include/linux/usb/serial.h            |  2 +-
 25 files changed, 147 insertions(+), 73 deletions(-)

-- 
2.39.3