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Dan Williams 5f02ece176 cxl/core: Fix potential payload size confusion in cxl_mem_get_poison() 
[ Upstream commit 4b759dd576 ]

A recent change to cxl_mem_get_records_log() [1] highlighted a subtle
nuance of looping calls to cxl_internal_send_cmd(), i.e. that
cxl_internal_send_cmd() modifies the 'size_out' member of the @mbox_cmd
argument. That mechanism is useful for communicating underflow, but it
is unwanted when reusing @mbox_cmd for a subsequent submission. It turns
out that cxl_xfer_log() avoids this scenario by always redefining
@mbox_cmd each iteration.

Update cxl_mem_get_records_log() and cxl_mem_get_poison() to follow the
same style as cxl_xfer_log(), i.e. re-define @mbox_cmd each iteration.
The cxl_mem_get_records_log() change is just a style fixup, but the
cxl_mem_get_poison() change is a potential fix, per Alison [2]:

    Poison list retrieval can hit this case if the MORE flag is set and
    a follow on read of the list delivers more records than the previous
    read.  ie. device gives one record, sets the _MORE flag, then gives 5.

Not an urgent fix since this behavior has not been seen in the wild,
but worth tracking as a fix.

Cc: Kwangjin Ko <kwangjin.ko@sk.com>
Cc: Alison Schofield <alison.schofield@intel.com>
Fixes: ed83f7ca39 ("cxl/mbox: Add GET_POISON_LIST mailbox command")
Link: http://lore.kernel.org/r/20240402081404.1106-2-kwangjin.ko@sk.com [1]
Link: http://lore.kernel.org/r/ZhAhAL/GOaWFrauw@aschofie-mobl2 [2]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/171235441633.2716581.12330082428680958635.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-05-02 16:35:16 +02:00
arch ARM: dts: microchip: at91-sama7g5ek: Replace regulator-suspend-voltage with the valid property 2024-05-02 16:35:15 +02:00
block block: fix module reference leakage from bdev_open_by_dev error path 2024-05-02 16:35:13 +02:00
certs
crypto
Documentation x86/bugs: Remove CONFIG_BHI_MITIGATION_AUTO and spectre_bhi=auto 2024-04-17 11:23:41 +02:00
drivers cxl/core: Fix potential payload size confusion in cxl_mem_get_poison() 2024-05-02 16:35:16 +02:00
fs cifs: reinstate original behavior again for forceuid/forcegid 2024-05-02 16:35:10 +02:00
include bootconfig: use memblock_free_late to free xbc memory to buddy 2024-04-27 17:13:03 +02:00
init init/main.c: Fix potential static_command_line memory overflow 2024-04-27 17:13:02 +02:00
io_uring io_uring: Fix io_cqring_wait() not restoring sigmask on get_timespec64() failure 2024-04-27 17:12:47 +02:00
ipc
kernel fork: defer linking file vma until vma is fully initialized 2024-04-27 17:13:04 +02:00
lib bootconfig: use memblock_free_late to free xbc memory to buddy 2024-04-27 17:13:03 +02:00
LICENSES
mm mm/shmem: inline shmem_is_huge() for disabled transparent hugepages 2024-04-27 17:13:02 +02:00
net bridge/br_netlink.c: no need to return void function 2024-05-02 16:35:15 +02:00
rust
samples
scripts gcc-plugins/stackleak: Avoid .head.text section 2024-04-13 13:10:11 +02:00
security selinux: avoid dereference of garbage after mount failure 2024-04-10 16:38:01 +02:00
sound ALSA: hda/realtek - Enable audio jacks of Haier Boyue G42 with ALC269VC 2024-04-27 17:12:57 +02:00
tools selftests/powerpc/papr-vpd: Fix missing variable initialization 2024-04-27 17:12:56 +02:00
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Makefile Linux 6.8.8 2024-04-27 17:13:05 +02:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
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In order to build the documentation, use ``make htmldocs`` or
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    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.