From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Peter Chen <peter.chen@kernel.org>
Cc: Jeaho Hwang <jhhwang@rtst.co.kr>, linux-usb@vger.kernel.org
Subject: Re: [PATCH] usb: chipidea: fix RT issue for udc
Date: Mon, 16 Aug 2021 07:22:32 +0200 [thread overview]
Message-ID: <YRn2GPsT8vB/NF/p@kroah.com> (raw)
In-Reply-To: <20210816005205.GA3907@nchen>
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.
next prev parent reply other threads:[~2021-08-16 5:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-10 6:02 [PATCH] usb: chipidea: fix RT issue for udc Jeaho Hwang
2021-08-13 7:08 ` Greg Kroah-Hartman
2021-08-16 0:52 ` Peter Chen
2021-08-16 1:03 ` Alan Stern
2021-08-16 3:52 ` Jeaho Hwang
2021-08-16 5:22 ` Greg Kroah-Hartman [this message]
2021-08-16 7:10 ` Jeaho Hwang
2021-08-16 7:16 ` Greg Kroah-Hartman
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