linux-kernel - Re: [PATCH v4] tty: serial: jsm: allocate queue buffer at probe time

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Message-ID: <CAHp75Vceenv5ctk6f_eEtXBVzodXHhnpuudaniLM9A1edqYrXA@mail.gmail.com>
Date:   Wed, 7 Jul 2021 15:52:07 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jiri Slaby <jirislaby@...nel.org>
Cc:     Zheyu Ma <zheyuma97@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] tty: serial: jsm: allocate queue buffer at probe time

On Wed, Jul 7, 2021 at 10:50 AM Jiri Slaby <jirislaby@...nel.org> wrote:
> On 05. 07. 21, 14:53, Zheyu Ma wrote:

> So how it comes an interrupt came before
> neo_param() in jsm_tty_open was called?

If IRQ is shared we have a special debug feature to test shared IRQs
on freeing IRQ stage (*).
But it doesn't matter, the IRQ handler must survive at any stage after
the action has been listed.

*) I believe we have quite a lot of drivers that will fail that test...

-- 
With Best Regards,
Andy Shevchenko