Re: [PATCH] usb: chipidea: fix RT issue for udc

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

On Mon, Aug 16, 2021 at 04:10:46PM +0900, Jeaho Hwang wrote:
> 2021년 8월 16일 (월) 오후 2:22, Greg Kroah-Hartman <gregkh@linuxfoundation.org>님이 작성:
> >
> > On Mon, Aug 16, 2021 at 08:52:06AM +0800, Peter Chen wrote:
> > > On 21-08-10 15:02:28, Jeaho Hwang wrote:
> > > > hw_ep_prime sometimes fails if irq occurs while it rus on RT kernel.
> > > > to prevent local_irq_save should keep the function from irqs.
> > > >
> > > > I am not sure where is the best to submit this patch, between RT and USB
> > > > community so sending to both. thanks.
> > >
> > > Greg, do you have any suggestions about it, the RT kernel schedules the interrupt
> > > handler (top-half) out which causes the USB hardware atomic sequences are broken,
> > > these hardware operations needs to be executed within limited time.
> >
> > Try working with the RT developers on this.
> 
> Then do you think those kinds of patches should be applied to linux-rt
> instead of mainline?

Depends on the resulting patch, if it is something that works for
mainline, then we will take it, otherwise if it is rt-only and is not
acceptable for mainline at this point in time, then it needs to go to
the rt tree until someone fixes it up there such that it can be
accepted.

thanks,

greg k-h