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Jan Kundrát 738845b022 serial: max310x: fix IO data corruption in batched operations 
[ Upstream commit 3f42b142ea ]

After upgrading from 5.16 to 6.1, our board with a MAX14830 started
producing lots of garbage data over UART. Bisection pointed out commit
285e76fc04 as the culprit. That patch tried to replace hand-written
code which I added in 2b4bac48c1 ("serial: max310x: Use batched reads
when reasonably safe") with the generic regmap infrastructure for
batched operations.

Unfortunately, the `regmap_raw_read` and `regmap_raw_write` which were
used are actually functions which perform IO over *multiple* registers.
That's not what is needed for accessing these Tx/Rx FIFOs; the
appropriate functions are the `_noinc_` versions, not the `_raw_` ones.

Fix this regression by using `regmap_noinc_read()` and
`regmap_noinc_write()` along with the necessary `regmap_config` setup;
with this patch in place, our board communicates happily again. Since
our board uses SPI for talking to this chip, the I2C part is completely
untested.

Fixes: 285e76fc04 ("serial: max310x: use regmap methods for SPI batch operations")
Cc: stable@vger.kernel.org
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Link: https://lore.kernel.org/r/79db8e82aadb0e174bc82b9996423c3503c8fb37.1680732084.git.jan.kundrat@cesnet.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-03-15 10:48:23 -04:00
arch um: allow not setting extra rpaths in the linux binary 2024-03-15 10:48:18 -04:00
block blk-iocost: Fix an UBSAN shift-out-of-bounds warning 2024-02-23 08:42:21 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:13:17 +02:00
crypto crypto: api - Disallow identical driver names 2024-02-23 08:41:52 +01:00
Documentation net: sysfs: Fix /sys/class/net/<iface> path for statistics 2024-02-23 08:42:23 +01:00
drivers serial: max310x: fix IO data corruption in batched operations 2024-03-15 10:48:23 -04:00
fs mm: hugetlb pages should not be reserved by shmat() if SHM_NORESERVE 2024-03-15 10:48:22 -04:00
include regmap: Add bulk read/write callbacks into regmap_config 2024-03-15 10:48:23 -04:00
init rootfs: Fix support for rootfstype= when root= is given 2024-01-25 14:37:52 -08:00
io_uring io_uring/rw: ensure io->bytes_done is always initialized 2024-01-25 14:37:52 -08:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:24:00 +01:00
kernel getrusage: use sig->stats_lock rather than lock_task_sighand() 2024-03-15 10:48:22 -04:00
lib crypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init 2024-02-23 08:42:30 +01:00
LICENSES
mm mm/hugetlb: change hugetlb_reserve_pages() to type bool 2024-03-15 10:48:22 -04:00
net lsm: make security_socket_getpeersec_stream() sockptr_t safe 2024-03-15 10:48:20 -04:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:01:09 +02:00
scripts bpf, scripts: Correct GPL license name 2024-03-01 13:16:50 +01:00
security lsm: fix default return value of the socket_getpeersec_*() hooks 2024-03-15 10:48:20 -04:00
sound ALSA: Drop leftover snd-rtctimer stuff from Makefile 2024-03-06 14:37:49 +00:00
tools selftests: mm: fix map_hugetlb failure on 64K page size systems 2024-03-15 10:48:18 -04:00
usr
virt KVM: use __vcalloc for very large allocations 2024-02-23 08:41:55 +01:00
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MAINTAINERS Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
Makefile Linux 5.10.212 2024-03-06 14:37:50 +00:00
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.