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[ Upstream commit7a0e4b1733] The frame checksum (FCS) is currently handled in gsm_queue() after reception of a frame. However, this breaks layering. A workaround with 'received_fcs' was implemented so far. Furthermore, frames are handled as such even if no end flag was received. Move FCS calculation from gsm_queue() to gsm0_receive() and gsm1_receive(). Also delay gsm_queue() call there until a full frame was received to fix both points. Fixes:e1eaea46bb("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20220414094225.4527-6-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.