From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: linux@meltdown.ru, Mark Brown <broonie@kernel.org>,
Alexandre Belloni <alexandre.belloni@free-electrons.com>,
Boris BREZILLON <boris.brezillon@free-electrons.com>,
linux-spi <linux-spi@vger.kernel.org>,
Ludovic Desroches <ludovic.desroches@atmel.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Cyrille Pitchen <cyrille.pitchen@atmel.com>,
Wenyou Yang <wenyou.yang@atmel.com>
Subject: Re: [PATCH] spi: atmel: use managed resource for gpio chip select
Date: Wed, 21 Sep 2016 10:20:27 +0200 [thread overview]
Message-ID: <CAMuHMdUQLkHn4=3U6TNjgTN--RUHZHsbwNu9dLdFrBJA0sx4aw@mail.gmail.com> (raw)
In-Reply-To: <20160921075528.14452-1-nicolas.ferre@atmel.com>
Hi Nicolas,
On Wed, Sep 21, 2016 at 9:55 AM, Nicolas Ferre <nicolas.ferre@atmel.com> wrote:
> Use the managed gpio CS pin request so that we avoid having trouble
> in the cleanup code.
> In fact, if module was configured with DT, cleanup code released
> invalid pin. Since resource wasn't freed, module cannot be reinserted.
>
> Reported-by: Alexander Morozov <linux@meltdown.ru>
> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> ---
> drivers/spi/spi-atmel.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index 8feac599e9ab..4e3f2345844a 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -1248,7 +1248,8 @@ static int atmel_spi_setup(struct spi_device *spi)
> return -ENOMEM;
>
> if (as->use_cs_gpios) {
> - ret = gpio_request(npcs_pin, dev_name(&spi->dev));
> + ret = devm_gpio_request(&spi->dev,
> + npcs_pin, dev_name(&spi->dev));
Note that spi_master.setup() can be called multiple times during the lifetime
of the spi_device.
> if (ret) {
> kfree(asd);
> return ret;
> @@ -1471,13 +1472,11 @@ static int atmel_spi_transfer_one_message(struct spi_master *master,
> static void atmel_spi_cleanup(struct spi_device *spi)
> {
> struct atmel_spi_device *asd = spi->controller_state;
> - unsigned gpio = (unsigned long) spi->controller_data;
>
> if (!asd)
> return;
>
> spi->controller_state = NULL;
> - gpio_free(gpio);
> kfree(asd);
> }
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2016-09-21 8:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-21 7:55 [PATCH] spi: atmel: use managed resource for gpio chip select Nicolas Ferre
2016-09-21 8:20 ` Geert Uytterhoeven [this message]
2016-11-07 13:54 ` Nicolas Ferre
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