On Mon, Sep 28, 2020 at 2:55 PM Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote: > > On Mon, Sep 28, 2020 at 12:41:47PM +0200, Bartosz Golaszewski wrote: > > From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> > > > > 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. > > Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> > But see below. > > > Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> > > --- > > include/linux/string_helpers.h | 2 ++ > > lib/string_helpers.c | 25 +++++++++++++++++++++++++ > > 2 files changed, 27 insertions(+) > > > > diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h > > index 86f150c2a6b6..55b25120a1c6 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 **str_array, size_t num_str); > > + > > #endif > > diff --git a/lib/string_helpers.c b/lib/string_helpers.c > > index 963050c0283e..bfa4c9f3ca0a 100644 > > --- a/lib/string_helpers.c > > +++ b/lib/string_helpers.c > > @@ -649,3 +649,28 @@ 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 > > + * > > + * @str_array: Dynamically allocated array of strings to free. If NULL - the > > + * function does nothing. > > + * @num_str: Number of strings (starting from the beginning of the array) to > > + * free. > > + * > > + * Passing a non-null str_array and num_str == 0 as well as NULL str_array > > + * are valid use-cases. > > + */ > > +void kfree_strarray(char **str_array, size_t num_str) > > Hmm... I have missed your answer to > str_array -> array > num_str -> n > > The rationale behind dropping str is to avoid duplicates in the name of the > function and its parameters. 'array' is harder to avoid, but also possible, > though I leave it to you. > Are you fine with me fixing this when applying the patches? Bart
