linux-kernel - Re: [PATCH v3 03/10] gpio-exar/8250-exar: Fix passing in of parent PCI device

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Message-ID: <CAHp75VcR+3XPvdJuKGdyCHGvAih1PWH4D7fKPH6+qaW4K589zw@mail.gmail.com>
Date:   Sat, 27 May 2017 16:41:41 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>,
        Sascha Weisenberger <sascha.weisenberger@...mens.com>
Subject: Re: [PATCH v3 03/10] gpio-exar/8250-exar: Fix passing in of parent
 PCI device

On Fri, May 26, 2017 at 7:02 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> This fixes reloading of the GPIO driver for the same platform device
> instance as created by the exar UART driver: First of all, the driver
> sets drvdata to its own value during probing and does not restore the
> original value on exit. But this won't help anyway as the core clears
> drvdata after the driver left.
>
> Set the platform device parent instead.

Now this one looks much better than first efforts.

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

>
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  drivers/gpio/gpio-exar.c            | 2 +-
>  drivers/tty/serial/8250/8250_exar.c | 3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c
> index 006a9a67c2a4..da4550bb9939 100644
> --- a/drivers/gpio/gpio-exar.c
> +++ b/drivers/gpio/gpio-exar.c
> @@ -119,7 +119,7 @@ static int exar_direction_input(struct gpio_chip *chip, unsigned int offset)
>
>  static int gpio_exar_probe(struct platform_device *pdev)
>  {
> -       struct pci_dev *pcidev = platform_get_drvdata(pdev);
> +       struct pci_dev *pcidev = to_pci_dev(pdev->dev.parent);
>         struct exar_gpio_chip *exar_gpio;
>         void __iomem *p;
>         int index, ret;
> diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
> index c29c7e675890..0f4b236d7e68 100644
> --- a/drivers/tty/serial/8250/8250_exar.c
> +++ b/drivers/tty/serial/8250/8250_exar.c
> @@ -203,7 +203,8 @@ xr17v35x_register_gpio(struct pci_dev *pcidev)
>         if (!pdev)
>                 return NULL;
>
> -       platform_set_drvdata(pdev, pcidev);
> +       pdev->dev.parent = &pcidev->dev;
> +
>         if (platform_device_add(pdev) < 0) {
>                 platform_device_put(pdev);
>                 return NULL;
> --
> 2.12.0
>



-- 
With Best Regards,
Andy Shevchenko