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Johannes Berg ab11cd8bcf um: line: Use separate IRQs per line 
[ Upstream commit d5a9597d69 ]

Today, all possible serial lines (ssl*=) as well as all
possible consoles (con*=) each share a single interrupt
(with a fixed number) with others of the same type.

Now, if you have two lines, say ssl0 and ssl1, and one
of them is connected to an fd you cannot read (e.g. a
file), but the other gets a read interrupt, then both
of them get the interrupt since it's shared. Then, the
read() call will return EOF, since it's a file being
written and there's nothing to read (at least not at
the current offset, at the end).

Unfortunately, this is treated as a read error, and we
close this line, losing all the possible output.

It might be possible to work around this and make the
IRQ sharing work, however, now that we have dynamically
allocated IRQs that are easy to use, simply use that to
achieve separating between the events; then there's no
interrupt for that line and we never attempt the read
in the first place, thus not closing the line.

This manifested itself in the wifi hostap/hwsim tests
where the parallel script communicates via one serial
console and the kernel messages go to another (a file)
and sending data on the communication console caused
the kernel messages to stop flowing into the file.

Reported-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-By: anton ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2022-06-14 18:41:39 +02:00
Documentation rtla/Makefile: Properly handle dependencies 2022-06-14 18:41:28 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch um: line: Use separate IRQs per line 2022-06-14 18:41:39 +02:00
block blk-mq: do not update io_ticks with passthrough requests 2022-06-14 18:41:23 +02:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: cryptd - Protect per-CPU resource by disabling BH. 2022-06-09 10:26:07 +02:00
drivers drm/amd/pm: Fix missing thermal throttler status 2022-06-14 18:41:38 +02:00
fs ceph: flush the mdlog for filesystem sync 2022-06-14 18:41:37 +02:00
include extcon: Fix extcon_get_extcon_dev() error handling 2022-06-14 18:41:35 +02:00
init Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug 2022-06-09 10:26:25 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:26:06 +02:00
kernel tracing: Avoid adding tracer option before update_tracer_options 2022-06-14 18:41:27 +02:00
lib iov_iter: Fix iter_xarray_get_pages{,_alloc}() 2022-06-14 18:41:33 +02:00
mm mm/memremap: fix missing call to untrack_pfn() in pagemap_range() 2022-06-09 10:26:28 +02:00
net net, neigh: Set lower cap for neigh_managed_work rearming 2022-06-14 18:41:37 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:26:22 +02:00
scripts modpost: fix removing numeric suffixes 2022-06-14 18:41:21 +02:00
security ima: remove the IMA_TEMPLATE Kconfig option 2022-06-09 10:26:25 +02:00
sound ASoC: rt5640: Do not manipulate pin "Platform Clock" if the "Platform Clock" is not in the DAPM 2022-06-14 18:41:37 +02:00
tools netfilter: nat: really support inet nat without l3 address 2022-06-14 18:41:29 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-25 09:59:03 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS net: dsa: realtek-smi: move to subdirectory 2022-04-08 13:58:12 +02:00
Makefile Linux 5.17.14 2022-06-09 10:26:33 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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
``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.