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Robert Hodaszi 00626325db usb: cdc-wdm: avoid setting WDM_READ for ZLP-s 
[ Upstream commit 387602d8a7 ]

Don't set WDM_READ flag in wdm_in_callback() for ZLP-s, otherwise when
userspace tries to poll for available data, it might - incorrectly -
believe there is something available, and when it tries to non-blocking
read it, it might get stuck in the read loop.

For example this is what glib does for non-blocking read (briefly):

  1. poll()
  2. if poll returns with non-zero, starts a read data loop:
    a. loop on poll() (EINTR disabled)
    b. if revents was set, reads data
      I. if read returns with EINTR or EAGAIN, goto 2.a.
      II. otherwise return with data

So if ZLP sets WDM_READ (#1), we expect data, and try to read it (#2).
But as that was a ZLP, and we are doing non-blocking read, wdm_read()
returns with EAGAIN (#2.b.I), so loop again, and try to read again
(#2.a.).

With glib, we might stuck in this loop forever, as EINTR is disabled
(#2.a).

Signed-off-by: Robert Hodaszi <robert.hodaszi@digi.com>
Acked-by: Oliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20250403144004.3889125-1-robert.hodaszi@digi.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-07-06 11:00:08 +02:00
arch um: use proper care when taking mmap lock during segfault 2025-07-06 11:00:07 +02:00
block scsi: sd_zbc: block: Respect bio vector limits for REPORT ZONES buffer 2025-05-22 14:12:22 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2025-04-25 10:45:58 +02:00
crypto crypto: xts - Only add ecb if it is not already there 2025-06-19 15:28:03 +02:00
Documentation dt-bindings: i2c: nvidia,tegra20-i2c: Specify the required properties 2025-06-27 11:09:03 +01:00
drivers usb: cdc-wdm: avoid setting WDM_READ for ZLP-s 2025-07-06 11:00:08 +02:00
fs ksmbd: provide zero as a unique ID to the Mac client 2025-07-06 11:00:06 +02:00
include net: make for_each_netdev_dump() a little more bug-proof 2025-06-27 11:09:03 +01:00
init sched/isolation: Make CONFIG_CPU_ISOLATION depend on CONFIG_SMP 2025-05-02 07:50:57 +02:00
io_uring io_uring: fix task leak issue in io_wq_create() 2025-06-27 11:08:58 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:08:49 +01:00
kernel perf/core: Fix WARN in perf_cgroup_switch() 2025-06-27 11:09:04 +01:00
lib pldmfw: Select CRC32 when PLDMFW is selected 2025-06-27 11:09:01 +01:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/huge_memory: fix dereferencing invalid pmd migration entry 2025-06-27 11:09:00 +01:00
net sunrpc: don't immediately retransmit on seqno miss 2025-07-06 11:00:05 +02:00
rust rust: module: place cleanup_module() in .exit.text section 2025-07-06 11:00:06 +02:00
samples samples/bpf: Fix compilation failure for samples/bpf on LoongArch Fedora 2025-06-04 14:41:53 +02:00
scripts kbuild: Disable -Wdefault-const-init-unsafe 2025-06-19 15:28:45 +02:00
security selinux: fix selinux_xfrm_alloc_user() to set correct ctx_len 2025-06-27 11:08:59 +01:00
sound ALSA: hda/realtek: enable headset mic on Latitude 5420 Rugged 2025-06-27 11:09:00 +01:00
tools perf evsel: Missed close() when probing hybrid core PMUs 2025-06-27 11:09:04 +01:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-13 12:58:38 +01:00
virt KVM: Use dedicated mutex to protect kvm_usage_count to avoid deadlock 2024-10-04 16:29:47 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-04 16:29:44 +02:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS sign-file,extract-cert: move common SSL helper functions to a header 2025-04-25 10:45:57 +02:00
Makefile Linux 6.6.95 2025-06-27 11:09:04 +01:00
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.