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Raul E Rangel 79a19bd936 serial: 8250: Fix TX deadlock when using DMA 
commit a424a34b8f upstream.

`dmaengine_terminate_async` does not guarantee that the
`__dma_tx_complete` callback will run. The callback is currently the
only place where `dma->tx_running` gets cleared. If the transaction is
canceled and the callback never runs, then `dma->tx_running` will never
get cleared and we will never schedule new TX DMA transactions again.

This change makes it so we clear `dma->tx_running` after we terminate
the DMA transaction. This is "safe" because `serial8250_tx_dma_flush`
is holding the UART port lock. The first thing the callback does is also
grab the UART port lock, so access to `dma->tx_running` is serialized.

Fixes: 9e512eaaf8 ("serial: 8250: Fix fifo underflow on flush")
Cc: stable <stable@kernel.org>
Signed-off-by: Raul E Rangel <rrangel@google.com>
Link: https://patch.msgid.link/20260209135815.1.I16366ecb0f62f3c96fe3dd5763fcf6f3c2b4d8cd@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-04-18 10:33:17 +02:00
arch x86/apic: Disable x2apic on resume if the kernel expects so 2026-04-18 10:33:16 +02:00
block blk-mq-debugfs: add missing debugfs_mutex in blk_mq_debugfs_register_hctxs() 2026-03-04 07:19:59 -05:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-02-06 16:41:53 +01:00
Documentation net: dpaa2: replace dpaa2_mac_is_type_fixed() with dpaa2_mac_is_type_phy() 2026-04-18 10:33:09 +02:00
drivers serial: 8250: Fix TX deadlock when using DMA 2026-04-18 10:33:17 +02:00
fs btrfs: abort transaction on failure to update root in the received subvol ioctl 2026-04-18 10:33:16 +02:00
include irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports 2026-04-18 10:33:15 +02:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:21:45 +02:00
io_uring io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop 2026-04-18 10:33:17 +02:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:05:26 +01:00
kernel bpf: Forget ranges when refining tnum after JSET 2026-04-18 10:33:16 +02:00
lib lib/bootconfig: check bounds before writing in __xbc_open_brace() 2026-04-18 10:33:16 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm, page_alloc, thp: prevent reclaim for __GFP_THISNODE THP allocations 2026-03-04 07:20:30 -05:00
net Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access 2026-04-18 10:33:17 +02:00
samples samples: mei: Fix building on musl libc 2025-08-28 16:24:07 +02:00
scripts modpost: Amend ppc64 save/restfpr symnames for -Os build 2026-03-04 07:20:06 -05:00
security apparmor: fix invalid deref of rawdata when export_binary is unset 2026-03-04 07:19:53 -05:00
sound ASoC: detect empty DMI strings 2026-04-18 10:33:13 +02:00
tools selftests: mptcp: more stable simult_flows tests 2026-04-18 10:33:09 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-06-27 11:05:22 +01:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:35:27 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.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 Remove *.orig pattern from .gitignore 2024-10-17 15:11:10 +02:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
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 staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:09:36 +09:00
Makefile Linux 5.15.202 2026-03-04 07:37:37 -05:00
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.