linux-kernel - Re: [PATCH v1 1/2] iio: core: Replace iio_sysfs_match_string_with_gaps() by __sysfs_match

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Message-ID: <5f9b713b-9c71-7da6-e674-b6ebd28dc5d5@metafoo.de>
Date:   Wed, 18 Jan 2023 07:22:30 -0800
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Michael Hennerich <michael.hennerich@...log.com>
Subject: Re: [PATCH v1 1/2] iio: core: Replace
 iio_sysfs_match_string_with_gaps() by __sysfs_match_string()

On 1/17/23 23:48, Andy Shevchenko wrote:
> None of the current users is using gaps in the list of the items.
> No need to have a specific function for that, just replace it by
> library available __sysfs_match_string().

Hm, I specifically remember adding this for a driver where there were 
gaps. One of the DACs. But it might be that the driver itself never made 
it upstream.

>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   drivers/iio/industrialio-core.c | 32 +-------------------------------
>   1 file changed, 1 insertion(+), 31 deletions(-)
>
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 52e690f031cb..26e357f14db8 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -205,36 +205,6 @@ bool iio_buffer_enabled(struct iio_dev *indio_dev)
>   }
>   EXPORT_SYMBOL_GPL(iio_buffer_enabled);
>   
> -/**
> - * iio_sysfs_match_string_with_gaps - matches given string in an array with gaps
> - * @array: array of strings
> - * @n: number of strings in the array
> - * @str: string to match with
> - *
> - * Returns index of @str in the @array or -EINVAL, similar to match_string().
> - * Uses sysfs_streq instead of strcmp for matching.
> - *
> - * This routine will look for a string in an array of strings.
> - * The search will continue until the element is found or the n-th element
> - * is reached, regardless of any NULL elements in the array.
> - */
> -static int iio_sysfs_match_string_with_gaps(const char * const *array, size_t n,
> -					    const char *str)
> -{
> -	const char *item;
> -	int index;
> -
> -	for (index = 0; index < n; index++) {
> -		item = array[index];
> -		if (!item)
> -			continue;
> -		if (sysfs_streq(item, str))
> -			return index;
> -	}
> -
> -	return -EINVAL;
> -}
> -
>   #if defined(CONFIG_DEBUG_FS)
>   /*
>    * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for
> @@ -569,7 +539,7 @@ ssize_t iio_enum_write(struct iio_dev *indio_dev,
>   	if (!e->set)
>   		return -EINVAL;
>   
> -	ret = iio_sysfs_match_string_with_gaps(e->items, e->num_items, buf);
> +	ret = __sysfs_match_string(e->items, e->num_items, buf);
>   	if (ret < 0)
>   		return ret;
>