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

[Lee Jones]

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@xxxxxxxxxxxxxxx>
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Cc: Alexandre Courbot <gnurou@xxxxxxxxx>
> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
> Reviewed-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
> Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Tested-by: Ville SyrjÃlà <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Shobhit Kumar <shobhit.kumar@xxxxxxxxx>
> ---
> v2: Ccing maintainers
> v3: Correct the subject line (Lee jones)

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

>  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 â Open source software for ARM SoCs
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