Re: [PATCH] gpio: shared: call gpio_chip::of_xlate() if set

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 3/17/26 11:12 AM, Jon Hunter wrote:
> Hi Bartosz,
> 
> On 16/03/2026 13:52, Bartosz Golaszewski wrote:
>> OF-based GPIO controller drivers may provide a translation function that
>> calculates the real chip offset from whatever devicetree sources
>> provide. We need to take this into account in the shared GPIO management
>> and call of_xlate() if it's provided and adjust the entry->offset we
>> initially set when scanning the tree.
>>
>> To that end: modify the shared GPIO API to take the GPIO chip as
>> argument on setup (to avoid having to rcu_dereference() it from the GPIO
>> device) and protect the access to entry->offset with the existing lock.
>>
>> Fixes: a060b8c511ab ("gpiolib: implement low-level, shared GPIO support")
>> Reported-by: Jon Hunter <jonathanh@nvidia.com>
>> Closes: https://lore.kernel.org/all/921ba8ce-b18e-4a99-966d-c763d22081e2@nvidia.com/
>> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
>> ---

[...]

> Thanks for sending this. However, I am seeing a different issue now ...
> 
>  ------------[ cut here ]------------
>  WARNING: drivers/gpio/gpiolib-shared.c:499 at gpio_shared_add_proxy_lookup+0x118/0x1d8, CPU#8: swapper/0/1

Not only this, this breaks suspend on the Qualcomm X1E CRD (probably all
/most QC devices by extension)

+CC Abel, Sibi in case this is what you've been chasing

with the patch:
[rootfs ]# echo mem > /sys/power/state 
[  226.043580] PM: suspend entry (deep)
[  226.047470] Filesystems sync: 0.000 seconds
[  226.058513] Freezing user space processes
[  226.066296] Freezing user space processes completed (elapsed 0.003 seconds)
[  226.073489] OOM killer disabled.
[  226.076843] Freezing remaining freezable tasks
[  226.082353] Freezing remaining freezable tasks completed (elapsed 0.000 seconds)
(give it some time, it dies)

without the patch:
[rootfs ]# echo mem > /sys/power/state [   38.047570] PM: suspend entry (deep)

[   38.053506] Filesystems sync: 0.001 seconds
[   38.082615] Freezing user space processes
[   38.092528] Freezing user space processes completed (elapsed 0.005 seconds)
[   38.099860] OOM killer disabled.
[   38.103222] Freezing remaining freezable tasks
[   38.110329] Freezing remaining freezable tasks completed (elapsed 0.002 seconds)
[   38.469231] dwc3-qcom-legacy a0f8800.usb: port-1 HS-PHY not in L2
[   38.652848] Disabling non-boot CPUs ...
[   38.668957] IRQ205: set affinity failed(-22).
[   38.669018] IRQ206: set affinity failed(-22).
[   38.669029] IRQ207: set affinity failed(-22).
[   38.670351] IRQ274: set affinity failed(-22).
[   38.671257] psci: CPU11 killed (polled 0 ms)
[   38.712308] IRQ205: set affinity failed(-22).
[   38.712323] IRQ206: set affinity failed(-22).
[   38.712333] IRQ207: set affinity failed(-22).
[   38.713634] IRQ274: set affinity failed(-22).
[   38.713821] psci: CPU10 killed (polled 0 ms)
[   38.754187] IRQ205: set affinity failed(-22).
[   38.754202] IRQ206: set affinity failed(-22).
[   38.756479] psci: CPU9 killed (polled 0 ms)
[   38.789962] psci: CPU8 killed (polled 0 ms)
[   38.803178] psci: CPU7 killed (polled 0 ms)
[   38.816286] psci: CPU6 killed (polled 0 ms)
[   38.828479] psci: CPU5 killed (polled 0 ms)
[   38.847479] psci: CPU4 killed (polled 0 ms)
[   38.873528] psci: CPU3 killed (polled 0 ms)
[   38.894399] psci: CPU2 killed (polled 0 ms)
[   38.905818] psci: CPU1 killed (polled 0 ms)
[   38.912658] Enabling non-boot CPUs ...
(resumes just fine)

Konrad