linux-kernel - Re: [PATCH V3 6/6] tty: serial: meson: Change request_irq to devm_request_irq and move devm_request_irq to meson_uart

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Date:   Thu, 30 Dec 2021 23:41:08 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Yu Tu <yu.tu@...ogic.com>
Cc:     linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Vyacheslav <adeep@...ina.in>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH V3 6/6] tty: serial: meson: Change request_irq to
 devm_request_irq and move devm_request_irq to meson_uart_probe()

On Thu, Dec 30, 2021 at 11:22 AM Yu Tu <yu.tu@...ogic.com> wrote:
>
> Because an interrupt error occurs when the user opens /dev/ttyAML* but
> don't close it, and then opens the same port again. This problem is
> encountered in actual projects.
I would like to hear from the serial driver maintainers whether the
described problem is a userspace or driver bug.

If it's a driver bug then this should be sent as a separate patch
(unrelated to this series) with a fixes tag.

[...]
> +       ret = devm_request_irq(&pdev->dev, port->irq, meson_uart_interrupt,
> +                              0, dev_name(&pdev->dev), port);
You can replace dev_name(&pdev->dev) with NULL to achieve the same
result with less code.
dev_name(dev) is the default value, see [0]


Best regards,
Martin


[0] https://elixir.bootlin.com/linux/v5.15/source/kernel/irq/devres.c#L64