gpio: reduce descriptor validation code size

While we do need macros to be able to return from the "calling"
function, we can still factor the checks done by the VALIDATE_DESC*
macros into a real helper function. This reduces the backslashtitis,
avoids duplicating the logic in the two macros and saves about 1K of
generated code:

$ scripts/bloat-o-meter drivers/gpio/gpiolib.o.{0,1}
add/remove: 1/0 grow/shrink: 0/15 up/down: 104/-1281 (-1177)
Function                                     old     new   delta
validate_desc                                  -     104    +104
gpiod_set_value                              192     135     -57
gpiod_set_raw_value                          125      67     -58
gpiod_direction_output                       412     351     -61
gpiod_set_value_cansleep                     150      70     -80
gpiod_set_raw_value_cansleep                 132      52     -80
gpiod_get_raw_value                          139      54     -85
gpiod_set_debounce                           226     140     -86
gpiod_direction_output_raw                   124      38     -86
gpiod_get_value                              161      74     -87
gpiod_cansleep                               126      39     -87
gpiod_get_raw_value_cansleep                 130      39     -91
gpiod_get_value_cansleep                     152      59     -93
gpiod_is_active_low                          128      33     -95
gpiod_request                                299     184    -115
gpiod_direction_input                        386     266    -120
Total: Before=25460, After=24283, chg -4.62%

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 27 insertions, 30 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 45c20307630a..fb1441315bc3 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2158,40 +2158,37 @@ done:
  * macro to avoid endless duplication. If the desc is NULL it is an
  * optional GPIO and calls should just bail out.
  */
+static int validate_desc(const struct gpio_desc *desc, const char *func)
+{
+        if (!desc)
+                return 0;
+        if (IS_ERR(desc)) {
+                pr_warn("%s: invalid GPIO (errorpointer)\n", func);
+                return PTR_ERR(desc);
+        }
+        if (!desc->gdev) {
+                pr_warn("%s: invalid GPIO (no device)\n", func);
+                return -EINVAL;
+        }
+        if (!desc->gdev->chip) {
+                dev_warn(&desc->gdev->dev,
+                         "%s: backing chip is gone\n", func);
+                return 0;
+        }
+        return 1;
+}
+
 #define VALIDATE_DESC(desc) do { \
-        if (!desc) \
-                return 0; \
-        if (IS_ERR(desc)) {                                             \
-                pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
-                return PTR_ERR(desc); \
-        } \
-        if (!desc->gdev) { \
-                pr_warn("%s: invalid GPIO (no device)\n", __func__); \
-                return -EINVAL; \
-        } \
-        if ( !desc->gdev->chip ) { \
-                dev_warn(&desc->gdev->dev, \
-                         "%s: backing chip is gone\n", __func__); \
-                return 0; \
-        } } while (0)
+        int __valid = validate_desc(desc, __func__); \
+        if (__valid <= 0) \
+                return __valid; \
+        } while (0)
 
 #define VALIDATE_DESC_VOID(desc) do { \
-        if (!desc) \
-                return; \
-        if (IS_ERR(desc)) {                                             \
-                pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
+        int __valid = validate_desc(desc, __func__); \
+        if (__valid <= 0) \
                 return; \
-        } \
-        if (!desc->gdev) { \
-                pr_warn("%s: invalid GPIO (no device)\n", __func__); \
-                return; \
-        } \
-        if (!desc->gdev->chip) { \
-                dev_warn(&desc->gdev->dev, \
-                         "%s: backing chip is gone\n", __func__); \
-                return; \
-        } } while (0)
-
+        } while (0)
 
 int gpiod_request(struct gpio_desc *desc, const char *label)
 {