linux-kernel - Re: [PATCH 1/5] gpio: thunderx: avoid potential deadlock

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Message-ID: <CAMRc=Mf91eMF7D6CRtA8-HQ7pdtP343WUGhLG4qti_9zJF4ELQ@mail.gmail.com>
Date:   Mon, 2 May 2022 13:18:49 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Piyush Malgujar <pmalgujar@...vell.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Robert Richter <rric@...nel.org>, cchavva@...vell.com,
        wsadowski@...vell.com
Subject: Re: [PATCH 1/5] gpio: thunderx: avoid potential deadlock

On Wed, Apr 27, 2022 at 4:46 PM Piyush Malgujar <pmalgujar@...vell.com> wrote:
>
> Using irqsave/irqrestore locking variants to avoid any deadlock.
>

I see you'll be resending this anyway so would you mind providing an
example of a deadlock that is possible with no-irqsave variants?
Thanks.

Bart

> Signed-off-by: Piyush Malgujar <pmalgujar@...vell.com>
> ---