linux-stable.git/Documentation, branch v6.6.145

PCI: Move Resizable BAR code to rebar.c

2026-07-24T14:03:48+00:00

[ Upstream commit 9f71938cd77f32a448f40a288e409eca60e55486 ]

For lack of a better place to put it, Resizable BAR code has been placed
inside pci.c and setup-res.c that do not use it for anything.  Upcoming
changes are going to add more Resizable BAR related functions, increasing
the code size.

As pci.c is huge as is, move the Resizable BAR related code and the BAR
resize code from setup-res.c to rebar.c.

Signed-off-by: Ilpo Järvinen 
Signed-off-by: Bjorn Helgaas 
Reviewed-by: Christian König 
Link: https://patch.msgid.link/20251113180053.27944-2-ilpo.jarvinen@linux.intel.com
Stable-dep-of: ee7471fe968d ("PCI: Skip Resizable BAR restore on read error")
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman

dt-bindings: net: renesas,ether: Drop example "ethernet-phy-ieee802.3-c22" fallback

2026-07-24T14:03:24+00:00

[ Upstream commit 14eb1d2c03b38ce3427f299967f7a4d97ebff4c2 ]

Fix the Micrel PHY in the example which shouldn't have the
fallback "ethernet-phy-ieee802.3-c22" compatible:

Documentation/devicetree/bindings/net/renesas,ether.example.dtb: ethernet-phy@1 \
  (ethernet-phy-id0022.1537): compatible: ['ethernet-phy-id0022.1537', 'ethernet-phy-ieee802.3-c22'] is too long
        from schema $id: http://devicetree.org/schemas/net/micrel.yaml

Signed-off-by: Rob Herring (Arm) 
Reviewed-by: Andrew Lunn 
Acked-by: Conor Dooley 
Acked-by: Niklas Söderlund 
Fixes: 37a2fce09001 ("dt-bindings: sh_eth convert bindings to json-schema")
Link: https://patch.msgid.link/20260624150250.131966-2-robh@kernel.org
Signed-off-by: Jakub Kicinski 
Signed-off-by: Sasha Levin

handshake: Require admin permission for DONE command

2026-07-24T14:03:12+00:00

[ Upstream commit 81246a65303d9635266b1334490142caaf86a11f ]

ACCEPT and DONE are the two downcalls of the handshake genl
family, both intended for use by the trusted handshake agent
(tlshd). ACCEPT already requires GENL_ADMIN_PERM; DONE has
no privilege check at all.

The fd-lookup in handshake_nl_done_doit() only confirms that
some pending handshake request exists for the supplied sockfd;
it does not authenticate the sender. An unprivileged process
that guesses or observes a valid sockfd can therefore submit
a DONE with HANDSHAKE_A_DONE_STATUS == 0, leaving the kernel
consumer to proceed as if the handshake succeeded. A non-zero
status on a forged DONE tears down a legitimate in-flight
handshake before tlshd can report its real result.

Fixes: 3b3009ea8abb ("net/handshake: Create a NETLINK service for handling handshake requests")
Reviewed-by: Jeff Layton 
Reviewed-by: Hannes Reinecke 
Signed-off-by: Chuck Lever 
Link: https://patch.msgid.link/20260609141831.90694-1-cel@kernel.org
Signed-off-by: Jakub Kicinski 
Signed-off-by: Sasha Levin

cpufreq: Documentation: fix conservative governor freq_step description

2026-07-24T14:03:08+00:00

[ Upstream commit 03120e1425262c7d11f93362a88e579a1720390b ]

The conservative governor documentation incorrectly states that setting
freq_step to 0 will use the default 5% frequency step. In reality, since
at least commit 8e677ce83bf4 ("[CPUFREQ] conservative: fixup governor to
function more like ondemand logic"), freq_step=0 has always caused the
governor to skip frequency updates entirely.

Correct the documentation to reflect the actual behavior: freq_step=0
disables frequency changes by the governor entirely.

Fixes: 2a0e49279850 ("cpufreq: User/admin documentation update and consolidation")
Signed-off-by: Pengjie Zhang 
Reviewed-by: Zhongqiu Han 
[ rjw: Subject adjustment ]
Link: https://patch.msgid.link/20260603055635.1549943-1-zhangpengjie2@huawei.com
Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Sasha Levin

nvdimm/btt: Handle preemption in BTT lane acquisition

2026-07-24T14:03:05+00:00

[ Upstream commit 8d4b989d9c9afe5f185aa5853b666fc4617afe9e ]

BTT lanes serialize access to per-lane metadata and workspace state
during BTT I/O. The btt-check unit test reports data mismatches during
BTT writes due to a race in lane acquisition that can lead to silent
data corruption.

The existing lane model uses a spinlock together with a per-CPU
recursion count. That recursion model stopped being valid after BTT
lanes became preemptible: another task can run on the same CPU,
observe a non-zero recursion count, bypass locking, and use the same
lane concurrently.

BTT lanes are also held across arena_write_bytes() calls. That path
reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush().
Some provider flush callbacks can sleep, making a spinlock the wrong
primitive for the lane lifetime.

Replace the spinlock-based recursion model with a dynamically
allocated per-lane mutex array and take the lane lock
unconditionally.

Add might_sleep() to catch any future atomic-context caller.

Found with the ndctl unit test btt-check.sh.

Fixes: 36c75ce3bd29 ("nd_btt: Make BTT lanes preemptible")
Assisted-by: Claude-Sonnet:4.5
Tested-by: Aboorva Devarajan 
Reviewed-by: Aboorva Devarajan 
Reviewed-by: Vishal Verma 
Reviewed-by: Dave Jiang 
Link: https://patch.msgid.link/20260528021625.618462-1-alison.schofield@intel.com
Signed-off-by: Alison Schofield 
Signed-off-by: Sasha Levin

cpufreq: Documentation: fix sampling_down_factor range

2026-07-24T14:03:02+00:00

[ Upstream commit 85524e651d20944399322d46fb97960337831d43 ]

The ondemand governor implementation accepts sampling_down_factor values
from 1 to 100000 via MAX_SAMPLING_DOWN_FACTOR, but the documentation in
admin-guide/pm/cpufreq.rst still says the valid range is 1 to 100.

Update the documentation to match the actual code.

Fixes: 2a0e49279850 ("cpufreq: User/admin documentation update and consolidation")
Reviewed-by: Zhongqiu Han 
Signed-off-by: Pengjie Zhang 
Link: https://patch.msgid.link/20260518133457.2408463-1-zhangpengjie2@huawei.com
Signed-off-by: Rafael J. Wysocki 
Signed-off-by: Sasha Levin

regulator: dt-bindings: mt6359: Drop regulator-name pattern restrictions

2026-07-24T14:03:01+00:00

[ Upstream commit cdc517688ffa2c30a64a20b558a9ecbf046c70f1 ]

The name of the regulator should match what the board design specifies
for the power rail. There should be no limitations on what the name can
be, and they definitely don't always follow the PMIC's own names.

Drop the restrictions on regulator-name.

Fixes: 8771456635d5 ("dt-bindings: regulator: Add document for MT6359 regulator")
Reviewed-by: Krzysztof Kozlowski 
Signed-off-by: Chen-Yu Tsai 
Link: https://patch.msgid.link/20260514091520.2718987-3-wenst@chromium.org
Signed-off-by: Mark Brown 
Signed-off-by: Sasha Levin

dt-bindings: pinctrl: nvidia,tegra234: Add missing required block

2026-07-24T14:02:58+00:00

[ Upstream commit 61b5deb5a968f7a82124f9b2591a6a151ed7273a ]

Binding should require 'reg' property, because address space cannot be
missing in the hardware and is already needed by the Linux drivers.
Require also 'compatible' by convention, although it is not strictly
necessary.

Fixes: 857982138b79 ("dt-bindings: pinctrl: Document Tegra234 pin controllers")
Signed-off-by: Krzysztof Kozlowski 
Acked-by: Rob Herring (Arm) 
Signed-off-by: Linus Walleij 
Signed-off-by: Sasha Levin

Documentation: proc: fix section numbering in table of contents

2026-07-24T14:02:58+00:00

[ Upstream commit 97a7bd8c2c58a6d820df563d1d0f68aafec45477 ]

Commit e24ccaaf7ec4 ("block: remove last remaining traces of IDE
documentation") removed the IDE section but left its table of
contents entry behind.
Fix the stale entry and renumber the following sections.

Fixes: e24ccaaf7ec4 ("block: remove last remaining traces of IDE documentation")
Signed-off-by: Baolin Liu 
Acked-by: Randy Dunlap 
Signed-off-by: Jonathan Corbet 
Message-ID: <20260424090654.19229-1-liubaolin12138@163.com>
Signed-off-by: Sasha Levin

dt-bindings: media: sun4i-a10-video-engine: Add interconnect properties

2026-07-24T14:02:57+00:00

commit 018f2dc3a42098d3b04edd1480adc51d268adb14 upstream.

The Allwinner video engine sits behind the MBUS that is represented as
an interconnect.

Make sure that the interconnect properties are valid in the binding.

Fixes: d41662e52a03 ("media: dt-bindings: media: allwinner,sun4i-a10-video-engine: Add R40 compatible")
Cc: stable@vger.kernel.org
Signed-off-by: Chen-Yu Tsai 
Acked-by: Rob Herring (Arm) 
Acked-by: Jernej Skrabec 
Signed-off-by: Nicolas Dufresne 
Signed-off-by: Hans Verkuil 
Signed-off-by: Greg Kroah-Hartman