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Johan Hovold a6fb73f4e0 USB: cdc-acm: fix TIOCGSERIAL implementation
[ Upstream commit 496960274153bdeb9d1f904ff1ea875cef8232c1 ]

TIOCSSERIAL is a horrid, underspecified, legacy interface which for most
serial devices is only useful for setting the close_delay and
closing_wait parameters.

The xmit_fifo_size parameter could be used to set the hardware transmit
fifo size of a legacy UART when it could not be detected, but the
interface is limited to eight bits and should be left unset when it is
not used.

Similarly, baud_base could be used to set the UART base clock when it
could not be detected, but might as well be left unset when it is not
known (which is the case for CDC).

Fix the cdc-acm TIOCGSERIAL implementation by dropping its custom
interpretation of the unused xmit_fifo_size and baud_base fields, which
overflowed the former with the URB buffer size and set the latter to the
current line speed. Also return the port line number, which is the only
other value used besides the close parameters.

Note that the current line speed can still be retrieved through the
standard termios interfaces.

Fixes: 18c75720e6 ("USB: allow users to run setserial with cdc-acm")
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210408131602.27956-4-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-05-14 09:44:21 +02:00
arch m68k: mvme147,mvme16x: Don't wipe PCC timer config bits 2021-05-14 09:44:19 +02:00
block block: only update parent bi_status when bio fail 2021-04-16 11:46:38 +02:00
certs certs: Fix blacklist flag type confusion 2021-03-04 10:26:29 +01:00
crypto crypto: rng - fix crypto_rng_reset() refcounting when !CRYPTO_STATS 2021-05-11 14:04:15 +02:00
Documentation dt-bindings: net: ethernet-controller: fix typo in NVMEM 2021-04-14 08:24:18 +02:00
drivers USB: cdc-acm: fix TIOCGSERIAL implementation 2021-05-14 09:44:21 +02:00
fs ovl: fix missing revert_creds() on error path 2021-05-14 09:44:16 +02:00
include spi: Fix use-after-free with devm_spi_alloc_* 2021-05-14 09:44:20 +02:00
init init/Kconfig: make COMPILE_TEST depend on HAS_IOMEM 2021-04-10 13:34:32 +02:00
ipc
kernel tracing: Restructure trace_clock_global() to never block 2021-05-11 14:04:18 +02:00
lib avoid __memcat_p link failure 2021-05-07 10:51:37 +02:00
LICENSES
mm mm: fix race by making init_zero_pfn() early_initcall 2021-04-07 14:47:42 +02:00
net cfg80211: scan: drop entry from hidden_list on overflow 2021-05-14 09:44:13 +02:00
samples samples, bpf: Add missing munmap in xdpsock 2021-03-17 17:03:33 +01:00
scripts ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount 2021-03-09 11:09:39 +01:00
security security: commoncap: fix -Wstringop-overread warning 2021-05-11 14:04:16 +02:00
sound ALSA: hda/realtek: ALC285 Thinkpad jack pin quirk is unreachable 2021-05-14 09:44:15 +02:00
tools perf ftrace: Fix access to pid in array when setting a pid filter 2021-05-07 10:51:37 +02:00
usr
virt KVM: Stop looking for coalesced MMIO zones if the bus is destroyed 2021-05-14 09:44:15 +02:00
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Makefile Linux 5.4.118 2021-05-11 14:04:18 +02:00
README

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
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    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.