Re: [BUG] platform_get_irq_byname_optional -- dwc3-haps registers IRQ 0, WARN on first gadget init

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Fri, Aug 28, 2026 at 05:34:05AM +0000, Farhad Alemi wrote:
> Hello,
> 
> As part of the kernel research at ASU's SEFCOM
> lab, we hit the crash below. Crash reports can be found here:
> 
>   https://github.com/farhad-alemi/public_bug_reports/tree/main/149-usb-dwc3-haps-registers-irq-0/

Digging through random urls isn't that helpful to us, please include all
of the needed information in the email itself.

Remember, some of us get 1000+ emails a day to handle :(

> 
>   dwc3 dwc3.2.auto: Configuration mismatch. dr_mode forced to gadget
>   0 is an invalid IRQ number
>   WARNING: drivers/base/platform.c:492 at
> platform_get_irq_byname_optional+0x1ed/0x220, CPU#1: repro/9498
>   Call Trace:
>    platform_get_irq_byname_optional+0x1ed/0x220
>    dwc3_gadget_init+0x607/0x2170
>    dwc3_core_init_mode+0x2f8/0x790
>    dwc3_core_probe+0x2345/0x2850
>    dwc3_probe+0x100/0x150
>    platform_probe+0xf9/0x190
>    really_probe+0x267/0xaf0
>    __driver_probe_device+0x1e2/0x350
>    driver_probe_device+0x4f/0x240
>    __device_attach_driver+0x270/0x410
>    bus_for_each_drv+0x258/0x2f0
>    __device_attach+0x2c5/0x450
> 
> Our reproducer.c is available upon request.
> 
> Happy to test a patch if that would help.

Please send a patch.

thanks,

greg k-h