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Filename Latest commit message Latest commit date
TATSUKAWA KOSUKE (立川 江介) d4dc28db1b n_tty: wake up poll(POLLRDNORM) on receiving data 
commit c816b2e65b0e86b95011418cad334f0524fc33b8 upstream.

The poll man page says POLLRDNORM is equivalent to POLLIN when used as
an event.
$ man poll
<snip>
              POLLRDNORM
                     Equivalent to POLLIN.

However, in n_tty driver, POLLRDNORM does not return until timeout even
if there is terminal input, whereas POLLIN returns.

The following test program works until kernel-3.17, but the test stops
in poll() after commit 57087d5154 ("tty: Fix spurious poll() wakeups").

[Steps to run test program]
  $ cc -o test-pollrdnorm test-pollrdnorm.c
  $ ./test-pollrdnorm
  foo          <-- Type in something from the terminal followed by [RET].
                   The string should be echoed back.

  ------------------------< test-pollrdnorm.c >------------------------
  #include <stdio.h>
  #include <errno.h>
  #include <poll.h>
  #include <unistd.h>

  void main(void)
  {
	int		n;
	unsigned char	buf[8];
	struct pollfd	fds[1] = {{ 0, POLLRDNORM, 0 }};

	n = poll(fds, 1, -1);
	if (n < 0)
		perror("poll");
	n = read(0, buf, 8);
	if (n < 0)
		perror("read");
	if (n > 0)
		write(1, buf, n);
  }
  ------------------------------------------------------------------------

The attached patch fixes this problem.  Many calls to
wake_up_interruptible_poll() in the kernel source code already specify
"POLLIN | POLLRDNORM".

Fixes: 57087d5154 ("tty: Fix spurious poll() wakeups")
Cc: stable@vger.kernel.org
Signed-off-by: Kosuke Tatsukawa <tatsu-ab1@nec.com>
Link: https://lore.kernel.org/r/TYCPR01MB81901C0F932203D30E452B3EA5209@TYCPR01MB8190.jpnprd01.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-02-16 12:52:52 +01:00
arch ARM: dts: imx6qdl-udoo: Properly describe the SD card detect 2022-02-16 12:52:50 +01:00
block block: bio-integrity: Advance seed correctly for larger interval sizes 2022-02-08 18:24:28 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-17 09:48:40 +01:00
Documentation bpf: Add kconfig knob for disabling unpriv bpf by default 2022-02-16 12:52:49 +01:00
drivers n_tty: wake up poll(POLLRDNORM) on receiving data 2022-02-16 12:52:52 +01:00
fs NFSv4 expose nfs_parse_server_name function 2022-02-16 12:52:48 +01:00
include net: fix a memleak when uncloning an skb dst and its metadata 2022-02-16 12:52:51 +01:00
init bpf: Add kconfig knob for disabling unpriv bpf by default 2022-02-16 12:52:49 +01:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel PM: s2idle: ACPI: Fix wakeup interrupts handling 2022-02-16 12:52:50 +01:00
lib lib/test_meminit: destroy cache in kmem_cache_alloc_bulk() test 2022-01-27 09:19:55 +01:00
LICENSES
mm mm/kmemleak: avoid scanning potential huge holes 2022-02-08 18:24:28 +01:00
net tipc: rate limit warning for received illegal binding update 2022-02-16 12:52:51 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts scripts/dtc: dtx_diff: remove broken example from help text 2022-01-27 09:19:55 +01:00
security ima: Do not print policy rule with inactive LSM labels 2022-02-16 12:52:47 +01:00
sound ASoC: max9759: fix underflow in speaker_gain_control_put() 2022-02-08 18:24:33 +01:00
tools perf probe: Fix ppc64 'perf probe add events failed' case 2022-02-16 12:52:50 +01:00
usr
virt KVM: do not shrink halt_poll_ns below grow_start 2021-10-09 14:39:50 +02:00
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.cocciconfig
.get_maintainer.ignore
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.gitignore
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Makefile Linux 5.4.179 2022-02-11 09:07:52 +01:00
README

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.