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Subject[PATCH 1/3] gpiolib: provide VALIDATE_DESC_PTR() macro
Date
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

We're about to add a public GPIO function that takes a descriptor as
argument and returns a pointer. Add a corresponding macro wrapping the
validate_desc() function that returns an ERR_PTR() on error.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/gpio/gpiolib.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 4d0106ceeba7..da8ffd40aa97 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2864,6 +2864,14 @@ static int validate_desc(const struct gpio_desc *desc, const char *func)
return; \
} while (0)

+#define VALIDATE_DESC_PTR(desc) do { \
+ int __valid = validate_desc(desc, __func__); \
+ if (__valid < 0) \
+ return ERR_PTR(__valid); \
+ if (__valid == 0) \
+ return NULL; \
+ } while (0)
+
int gpiod_request(struct gpio_desc *desc, const char *label)
{
int ret = -EPROBE_DEFER;
--
2.25.0
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