linux-kernel - Re: [PATCH v6 01/11] firmware: raspberrypi: Keep count of all consumers

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Message-ID: <CAMpxmJUoTHq+ZMm6UOH3tmhGMuDEG5sPn4hiXiZdwSP3FV-hjg@mail.gmail.com>
Date:   Wed, 16 Dec 2020 11:37:02 +0100
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com, linux-pwm@...r.kernel.org,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        linux-devicetree <devicetree@...r.kernel.org>, wahrenst@....net,
        Linux Input <linux-input@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, Philipp Zabel <p.zabel@...gutronix.de>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v6 01/11] firmware: raspberrypi: Keep count of all consumers

On Fri, Dec 11, 2020 at 5:48 PM Nicolas Saenz Julienne
<nsaenzjulienne@...e.de> wrote:
>
> When unbinding the firmware device we need to make sure it has no
> consumers left. Otherwise we'd leave them with a firmware handle
> pointing at freed memory.
>
> Keep a reference count of all consumers and introduce rpi_firmware_put()
> which will permit automatically decrease the reference count upon
> unbinding consumer drivers.
>
> Suggested-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
>
> ---

Reviewed-by: Bartosz Golaszewski <bgolaszewski@...libre.com>