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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2021-11-05 14:42:25 +0200
committerAndy Shevchenko <andriy.shevchenko@linux.intel.com>2021-11-18 18:40:08 +0200
commitacdb89b6c87a2d7b5c48a82756e6f5c6f599f60a (patch)
tree65bc8470331f571e3539593ce27ea5a2062e0291 /lib
parent418e0a3551bbef5b221705b0e5b8412cdc0afd39 (diff)
lib/string_helpers: Introduce managed variant of kasprintf_strarray()
Some of the users want to have easy way to allocate array of strings that will be automatically cleaned when associated device is gone. Introduce managed variant of kasprintf_strarray() for such use cases. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/string_helpers.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 9758997c465e..90f9f1b7afec 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -10,6 +10,7 @@
#include <linux/math64.h>
#include <linux/export.h>
#include <linux/ctype.h>
+#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/limits.h>
@@ -730,6 +731,36 @@ void kfree_strarray(char **array, size_t n)
}
EXPORT_SYMBOL_GPL(kfree_strarray);
+struct strarray {
+ char **array;
+ size_t n;
+};
+
+static void devm_kfree_strarray(struct device *dev, void *res)
+{
+ struct strarray *array = res;
+
+ kfree_strarray(array->array, array->n);
+}
+
+char **devm_kasprintf_strarray(struct device *dev, const char *prefix, size_t n)
+{
+ struct strarray *ptr;
+
+ ptr = devres_alloc(devm_kfree_strarray, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ ptr->array = kasprintf_strarray(GFP_KERNEL, prefix, n);
+ if (!ptr->array) {
+ devres_free(ptr);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return ptr->array;
+}
+EXPORT_SYMBOL_GPL(devm_kasprintf_strarray);
+
/**
* strscpy_pad() - Copy a C-string into a sized buffer
* @dest: Where to copy the string to