linux-kernel - Re: [PATCH v4 00/10] gpio: improve support for shared GPIOs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <3b5d9df5-934d-4591-8827-6c9573a6f7ba@packett.cool>
Date: Thu, 20 Nov 2025 21:27:46 -0300
From: Val Packett <val@...kett.cool>
To: Bartosz Golaszewski <brgl@...ev.pl>, Kees Cook <kees@...nel.org>,
 Mika Westerberg <westeri@...nel.org>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Linus Walleij <linus.walleij@...aro.org>,
 Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Andy Shevchenko <andy@...nel.org>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Srinivas Kandagatla <srini@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>, Alexey Klimov <alexey.klimov@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v4 00/10] gpio: improve support for shared GPIOs

Hi,

On 11/12/25 10:55 AM, Bartosz Golaszewski wrote:
> ---
> Bartosz Golaszewski (10):
>        string: provide strends()
>        gpiolib: define GPIOD_FLAG_SHARED
>        gpiolib: implement low-level, shared GPIO support
>        gpio: shared-proxy: implement the shared GPIO proxy driver
>        gpiolib: support shared GPIOs in core subsystem code
>        gpio: provide gpiod_is_shared()
>        arm64: select HAVE_SHARED_GPIOS for ARCH_QCOM
>        ASoC: wsa881x: drop GPIOD_FLAGS_BIT_NONEXCLUSIVE flag from GPIO lookup
>        ASoC: wsa883x: drop GPIOD_FLAGS_BIT_NONEXCLUSIVE flag from GPIO lookup
>        regulator: make the subsystem aware of shared GPIOs

this seems to actually have caused a regression for me, audio does not 
initialize anymore on hamoa due to EBUSY since upgrading 
from next-20251114 to next-20251118 or next-20251120:

[   11.748781] platform 
6800000.remoteproc:glink-edge:gpr:service@1:dais: Adding to iommu group 30
[   11.785864] wsa_macro 6aa0000.codec: using zero-initialized flat 
cache, this may cause unexpected behavior
[   11.796964] reset-gpio reset-gpio.0: error -EBUSY: Could not get 
reset gpios
[   11.796984] reset-gpio reset-gpio.0: probe with driver reset-gpio 
failed with error -16
[   11.894662] reset-gpio reset-gpio.1: error -EBUSY: Could not get 
reset gpios
[   11.894676] reset-gpio reset-gpio.1: probe with driver reset-gpio 
failed with error -16
[   12.006938] wcd938x_codec audio-codec: bound sdw:2:0:0217:010d:00:4 
(ops wcd_sdw_component_ops [snd_soc_wcd_common])
[   12.006964] wcd938x_codec audio-codec: bound sdw:3:0:0217:010d:00:3 
(ops wcd_sdw_component_ops [snd_soc_wcd_common])
[   15.424657] qcom-soundwire 6ab0000.soundwire: qcom_swrm_irq_handler: 
SWR CMD error, fifo status 0x4e00c00f, flushing fifo
[   21.994354] qcom-soundwire 6ab0000.soundwire: qcom_swrm_irq_handler: 
SWR CMD error, fifo status 0xe00c000, flushing fifo
[   21.996001] qcom-soundwire 6b10000.soundwire: qcom_swrm_irq_handler: 
SWR CMD error, fifo status 0x4e00c00f, flushing fifo
[   21.996239] platform sound: deferred probe pending: snd-x1e80100: WSA 
Playback: codec dai not found
[   21.996248] soundwire sdw:4:0:0217:0204:00:0: deferred probe pending: 
wsa884x-codec: Failed to get reset
[   21.996250] soundwire sdw:4:0:0217:0204:00:1: deferred probe pending: 
wsa884x-codec: Failed to get reset
[   21.996251] soundwire sdw:1:0:0217:0204:00:0: deferred probe pending: 
wsa884x-codec: Failed to get reset
[   21.996253] soundwire sdw:1:0:0217:0204:00:1: deferred probe pending: 
wsa884x-codec: Failed to get reset

gpio_shared_proxy, reset_gpio, pinctrl_sm8550_lpass_lpi are all built as 
modules and were autoloaded fine.

This is wsa884x (not wsa881x nor wsa883x), failing in 
devm_reset_control_get_optional_shared..


Thanks,
~val