Re: git: 55a3bd000d97 - main - usb(4): Make sure the enumeration thread doesn't loop too fast.

From: Kubilay Kocak <koobs_at_FreeBSD.org>
Date: Fri, 07 Oct 2022 00:27:06 UTC 
On 5/10/2022 9:13 pm, Hans Petter Selasky wrote:
> The branch main has been updated by hselasky:
> 
> URL: https://cgit.FreeBSD.org/src/commit/?id=55a3bd000d9799f431c207e359466484ac63c137
> 
> commit 55a3bd000d9799f431c207e359466484ac63c137
> Author:     Hans Petter Selasky <hselasky@FreeBSD.org>
> AuthorDate: 2022-06-09 13:15:49 +0000
> Commit:     Hans Petter Selasky <hselasky@FreeBSD.org>
> CommitDate: 2022-10-05 10:12:33 +0000
> 
>      usb(4): Make sure the enumeration thread doesn't loop too fast.
>      
>      MFC after:      1 week
>      Sponsored by:   NVIDIA Networking
> ---
>   sys/dev/usb/controller/usb_controller.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/sys/dev/usb/controller/usb_controller.c b/sys/dev/usb/controller/usb_controller.c
> index 0897af0492cb..959f54a4583f 100644
> --- a/sys/dev/usb/controller/usb_controller.c
> +++ b/sys/dev/usb/controller/usb_controller.c
> @@ -414,6 +414,9 @@ usb_bus_explore(struct usb_proc_msg *pm)
>   #if USB_HAVE_ROOT_MOUNT_HOLD
>   	usb_root_mount_rel(bus);
>   #endif
> +
> +	/* Nice the enumeration a bit, to avoid looping too fast. */
> +	usb_pause_mtx(&bus->bus_mtx, USB_MS_TO_TICKS(16));
>   }
>   
>   /*------------------------------------------------------------------------*
> 

Is it possible to sysctl (ideally runtime tunable) this setting?