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Marc Kleine-Budde 4ee68cf530 can: mcp251xfd: mcp251xfd_get_tef_len(): fix length calculation 
commit 3c1c18551e upstream.

Commit b8e0ddd36c ("can: mcp251xfd: tef: prepare to workaround
broken TEF FIFO tail index erratum") introduced
mcp251xfd_get_tef_len() to get the number of unhandled transmit events
from the Transmit Event FIFO (TEF).

As the TEF has no head pointer, the driver uses the TX FIFO's tail
pointer instead, assuming that send frames are completed. However the
check for the TEF being full was not correct. This leads to the driver
stop working if the TEF is full.

Fix the TEF full check by assuming that if, from the driver's point of
view, there are no free TX buffers in the chip and the TX FIFO is
empty, all messages must have been sent and the TEF must therefore be
full.

Reported-by: Sven Schuchmann <schuchmann@schleissheimer.de>
Closes: https://patch.msgid.link/FR3P281MB155216711EFF900AD9791B7ED9692@FR3P281MB1552.DEUP281.PROD.OUTLOOK.COM
Fixes: b8e0ddd36c ("can: mcp251xfd: tef: prepare to workaround broken TEF FIFO tail index erratum")
Tested-by: Sven Schuchmann <schuchmann@schleissheimer.de>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20241104-mcp251xfd-fix-length-calculation-v3-1-608b6e7e2197@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-11-14 13:15:14 +01:00
arch ARM: dts: rockchip: Fix the realtek audio codec on rk3036-kylin 2024-11-14 13:15:10 +01:00
block block: fix sanity checks in blk_rq_map_user_bvec 2024-11-08 16:26:45 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: simd - Do not call crypto_alloc_tfm during registration 2024-10-17 15:21:39 +02:00
Documentation ASoC: dt-bindings: davinci-mcasp: Fix interrupt properties 2024-11-01 01:56:05 +01:00
drivers can: mcp251xfd: mcp251xfd_get_tef_len(): fix length calculation 2024-11-14 13:15:14 +01:00
fs nfs: avoid i_lock contention in nfs_clear_invalid_mapping 2024-11-14 13:15:11 +01:00
include NFSv3: handle out-of-order write replies. 2024-11-14 13:15:10 +01:00
init rust: fix the default format for CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT 2024-08-29 17:30:32 +02:00
io_uring io_uring: always lock __io_cqring_overflow_flush 2024-11-08 16:26:47 +01:00
ipc sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table) 2024-08-11 12:35:51 +02:00
kernel cgroup/bpf: use a dedicated workqueue for cgroup bpf destruction 2024-11-08 16:26:45 +01:00
lib maple_tree: correct tree corruption on spanning store 2024-10-22 15:56:44 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm migrate_pages_batch: fix statistics for longterm pin retry 2024-11-08 16:26:48 +01:00
net sctp: properly validate chunk size in sctp_sf_ootb() 2024-11-14 13:15:11 +01:00
rust rust: macros: provide correct provenance when constructing THIS_MODULE 2024-10-17 15:22:24 +02:00
samples bpf: Replace bpf_lpm_trie_key 0-length array with flexible array 2024-08-29 17:30:22 +02:00
scripts kconfig: qconf: fix buffer overflow in debug links 2024-10-17 15:22:03 +02:00
security security/keys: fix slab-out-of-bounds in key_task_permission 2024-11-14 13:15:11 +01:00
sound ASoC: stm32: spdifrx: fix dma channel release in stm32_spdifrx_remove 2024-11-14 13:15:13 +01:00
tools tools/lib/thermal: Fix sampling handler context ptr 2024-11-14 13:15:13 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-06-27 13:46:21 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.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: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:21:15 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.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 MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
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 MAINTAINERS: add leah to 6.1 MAINTAINERS file 2024-05-17 11:56:16 +02:00
Makefile Linux 6.1.116 2024-11-08 16:26:48 +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.