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authorBartosz Golaszewski <bartosz.golaszewski@linaro.org>2023-12-04 12:35:00 +0300
committerBartosz Golaszewski <bartosz.golaszewski@linaro.org>2023-12-08 11:25:53 +0300
commitee25fba76acd8324f9de6628872c8c612a684209 (patch)
tree9133043e88c4577cd4169780bd282f0686350a29 /drivers/gpio
parentb85ea95d086471afb4ad062012a4d73cd328fa86 (diff)
downloadlinux-ee25fba76acd8324f9de6628872c8c612a684209.tar.xz
gpiolib: provide gpiochip_dup_line_label()
gpiochip_is_requested() not only has a misleading name but it returns a pointer to a string that is freed when the descriptor is released. Provide a new helper meant to replace it, which returns a copy of the label string instead. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Acked-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 95d2a7b2ea3e..0147c900afea 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2387,6 +2387,35 @@ const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset)
EXPORT_SYMBOL_GPL(gpiochip_is_requested);
/**
+ * gpiochip_dup_line_label - Get a copy of the consumer label.
+ * @gc: GPIO chip controlling this line.
+ * @offset: Hardware offset of the line.
+ *
+ * Returns:
+ * Pointer to a copy of the consumer label if the line is requested or NULL
+ * if it's not. If a valid pointer was returned, it must be freed using
+ * kfree(). In case of a memory allocation error, the function returns %ENOMEM.
+ *
+ * Must not be called from atomic context.
+ */
+char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset)
+{
+ const char *label;
+ char *copy;
+
+ label = gpiochip_is_requested(gc, offset);
+ if (!label)
+ return NULL;
+
+ copy = kstrdup(label, GFP_KERNEL);
+ if (!copy)
+ return ERR_PTR(-ENOMEM);
+
+ return copy;
+}
+EXPORT_SYMBOL_GPL(gpiochip_dup_line_label);
+
+/**
* gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor
* @gc: GPIO chip
* @hwnum: hardware number of the GPIO for which to request the descriptor