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Filename Latest commit message Latest commit date
Jan Kundrát 59b3583da1 serial: max310x: fix IO data corruption in batched operations 
[ Upstream commit 3f42b142ea1171967e40e10e4b0241c0d6d28d41 ]

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
285e76fc049c 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: 285e76fc049c ("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 10:48:20 -04:00
arch y2038: rusage: use __kernel_old_timeval 2024-03-15 10:48:18 -04:00
block blk-mq: fix IO hang from sbitmap wakeup race 2024-02-23 08:25:03 +01:00
certs
crypto crypto: api - Disallow identical driver names 2024-02-23 08:24:48 +01:00
Documentation net: sysfs: Fix /sys/class/net/<iface> path 2024-02-23 08:25:05 +01:00
drivers serial: max310x: fix IO data corruption in batched operations 2024-03-15 10:48:20 -04:00
fs fs,hugetlb: fix NULL pointer dereference in hugetlbs_fill_super 2024-03-06 14:36:10 +00:00
include regmap: Add bulk read/write callbacks into regmap_config 2024-03-15 10:48:20 -04:00
init rootfs: Fix support for rootfstype= when root= is given 2024-01-25 14:34:30 -08:00
ipc
kernel getrusage: use sig->stats_lock rather than lock_task_sighand() 2024-03-15 10:48:19 -04:00
lib ida: Fix crash in ida_free when the bitmap is empty 2024-01-25 14:34:21 -08:00
LICENSES
mm userfaultfd: fix mmap_changing checking in mfill_atomic_hugetlb 2024-03-01 13:13:33 +01:00
net netrom: Fix data-races around sysctl_net_busy_read 2024-03-15 10:48:16 -04:00
samples samples/bpf: Fix buffer overflow in tcp_basertt 2023-07-27 08:37:07 +02:00
scripts scripts/bpf: Fix xdp_md forward declaration typo 2024-03-01 13:13:38 +01:00
security lsm: new security_file_ioctl_compat() hook 2024-02-23 08:25:15 +01:00
sound ALSA: Drop leftover snd-rtctimer stuff from Makefile 2024-03-06 14:36:09 +00:00
tools selftests: mm: fix map_hugetlb failure on 64K page size systems 2024-03-15 10:48:16 -04:00
usr
virt KVM: arm64: vgic-its: Test for valid IRQ in MOVALL handler 2024-03-01 13:13:32 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
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.gitignore
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COPYING
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MAINTAINERS iio: stx104: Move to addac subdirectory 2023-08-30 16:27:12 +02:00
Makefile Linux 5.4.271 2024-03-06 14:36:10 +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.