linux-kernel - Re: [v3 1/7] gpiolib: Add support for removing registered consumer lookup table

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Message-ID: <20150701074601.GE3210@x1>
Date:	Wed, 1 Jul 2015 08:46:01 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Shobhit Kumar <shobhit.kumar@...el.com>
Cc:	linux-pwm <linux-pwm@...r.kernel.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-gpio <linux-gpio@...r.kernel.org>,
	Paul Bolle <pebolle@...cali.nl>,
	Jani Nikula <jani.nikula@...el.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Alexandre Courbot <gnurou@...il.com>,
	David Airlie <airlied@...ux.ie>,
	Povilas Staniulis <wdmonster@...il.com>,
	Chih-Wei Huang <cwhuang@...roid-x86.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	bloften80@...il.com, varkabhadram@...il.com
Subject: Re: [v3 1/7] gpiolib: Add support for removing registered consumer
 lookup table

On Fri, 26 Jun 2015, Shobhit Kumar wrote:

> In case we unload and load a driver module again that is registering a
> lookup table, without this it will result in multiple entries. Provide
> an option to remove the lookup table on driver unload
> 
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Alexandre Courbot <gnurou@...il.com>
> Cc: Thierry Reding <thierry.reding@...il.com>
> Reviewed-by: Alexandre Courbot <acourbot@...dia.com>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> Tested-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@...el.com>
> ---
> v2: Ccing maintainers
> v3: Correct the subject line (Lee jones)

Acked-by: Lee Jones <lee.jones@...aro.org>

>  drivers/gpio/gpiolib.c       | 13 +++++++++++++
>  include/linux/gpio/machine.h |  1 +
>  2 files changed, 14 insertions(+)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 957ede5..9d3ea4e 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1675,6 +1675,19 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
>  	mutex_unlock(&gpio_lookup_lock);
>  }
>  
> +/**
> + * gpiod_remove_lookup_table() - unregister GPIO device consumers
> + * @table: table of consumers to unregister
> + */
> +void gpiod_remove_lookup_table(struct gpiod_lookup_table *table)
> +{
> +	mutex_lock(&gpio_lookup_lock);
> +
> +	list_del(&table->list);
> +
> +	mutex_unlock(&gpio_lookup_lock);
> +}
> +
>  static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
>  				      unsigned int idx,
>  				      enum gpio_lookup_flags *flags)
> diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h
> index e270614..c0d712d 100644
> --- a/include/linux/gpio/machine.h
> +++ b/include/linux/gpio/machine.h
> @@ -57,5 +57,6 @@ struct gpiod_lookup_table {
>  }
>  
>  void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
> +void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
>  
>  #endif /* __LINUX_GPIO_MACHINE_H */

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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