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SubjectRe: [PATCH v3 01/10] lib: string_helpers: provide kfree_strarray()
On Tue, Sep 29, 2020 at 12:09:55PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> There's a common pattern of dynamically allocating an array of char
> pointers and then also dynamically allocating each string in this
> array. Provide a helper for freeing such a string array with one call.

Thanks! Below couple of nits you may address during applying phase.

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
> include/linux/string_helpers.h | 2 ++
> lib/string_helpers.c | 24 ++++++++++++++++++++++++
> 2 files changed, 26 insertions(+)
>
> diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
> index 86f150c2a6b6..fa06dcdc481e 100644
> --- a/include/linux/string_helpers.h
> +++ b/include/linux/string_helpers.h
> @@ -94,4 +94,6 @@ char *kstrdup_quotable(const char *src, gfp_t gfp);
> char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);
> char *kstrdup_quotable_file(struct file *file, gfp_t gfp);
>
> +void kfree_strarray(char **array, size_t n);
> +
> #endif
> diff --git a/lib/string_helpers.c b/lib/string_helpers.c
> index 963050c0283e..efeee2353613 100644
> --- a/lib/string_helpers.c
> +++ b/lib/string_helpers.c
> @@ -649,3 +649,27 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp)
> return pathname;
> }
> EXPORT_SYMBOL_GPL(kstrdup_quotable_file);
> +
> +/**
> + * kfree_strarray - free a number of dynamically allocated strings contained
> + * in an array and the array itself

> + * @array: Dynamically allocated array of strings to free. If NULL - the
> + * function does nothing.

I would rather move second sentence to the description below.

> + * @n: Number of strings (starting from the beginning of the array) to free.
> + *

> + * Passing a non-null @array and @n == 0 as well as NULL @array are valid

non-null -> non-NULL, and extra space before 'are'.

> + * use-cases.
> + */
> +void kfree_strarray(char **array, size_t n)
> +{
> + unsigned int i;
> +
> + if (!array)
> + return;
> +
> + for (i = 0; i < n; i++)
> + kfree(array[i]);
> + kfree(array);
> +}
> +EXPORT_SYMBOL_GPL(kfree_strarray);
> --
> 2.26.1
>

--
With Best Regards,
Andy Shevchenko


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