linux-kernel - Re: [PATCH v2] usb: chipidea: local_irq_save/restore added for hw_ep

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Message-ID: <20210823161401.ix6l33o3sja7sy45@linutronix.de>
Date:   Mon, 23 Aug 2021 18:14:01 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Jeaho Hwang <jhhwang@...t.co.kr>
Cc:     Peter Chen <peter.chen@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-rt-users@...r.kernel.org, Linux team <team-linux@...t.co.kr>,
        변무광(Byeon Moo Kwang)/자동화연)Automation Platform연구팀 
        <mkbyeon@...lectric.co.kr>,
        최기홍(Choi Ki Hong)/자동화연)Automation Platform연구팀 
        <khchoib@...lectric.co.kr>
Subject: Re: [PATCH v2] usb: chipidea: local_irq_save/restore added for
 hw_ep_prime

On 2021-08-21 16:04:01 [+0900], Jeaho Hwang wrote:
> 2021년 8월 21일 (토) 오후 2:05, Peter Chen <peter.chen@...nel.org>님이 작성:
> >
> HI Peter.
> 
> We configured the kernel as "low latency desktop" and added
> "threadirqs" inside the cmdline parameter.
> Then udc irq handler runs as a thread and shows no suspicious working.
> I Hope It will help.

May I again point out that since commit
   81e2073c175b8 ("genirq: Disable interrupts for force threaded handlers")                                                                                         

the threaded handler runs with disabled interrupts. This time more
verbose. It is available since v5.12-rc4 but it has been also applied
for stable.

> Thanks.

Sebastian